diff --git a/modules/ca/src/client/access.cpp b/modules/ca/src/client/access.cpp
index 9c94d61c5..58cc4bca5 100644
--- a/modules/ca/src/client/access.cpp
+++ b/modules/ca/src/client/access.cpp
@@ -88,7 +88,7 @@ const char * ca_message_text []
 "Bad event subscription (monitor) identifier",
 "Remote channel has new network address",
 "New or resumed network connection",
-"Specified task isnt a member of a CA context",
+"Specified task isn't a member of a CA context",
 "Attempt to use defunct CA feature failed",
 
 "The supplied string is empty",
@@ -324,7 +324,7 @@ int epicsStdCall ca_create_channel (
         *chanptr = pChanNotify;
         pChanNotify->initiateConnect ( guard );
         // no need to worry about a connect preempting here because
-        // the connect sequence will not start untill initiateConnect()
+        // the connect sequence will not start until initiateConnect()
         // is called
     }
     catch ( cacChannel::badString & ) {
@@ -384,9 +384,9 @@ int epicsStdCall ca_clear_channel ( chid pChan )
         // we will definately stall out here if all of the
         // following are true
         //
-        // o user creates non-preemtive mode client library context
+        // o user creates non-preemptive mode client library context
         // o user doesnt periodically call a ca function
-        // o user calls this function from an auxiillary thread
+        // o user calls this function from an auxiliary thread
         //
         CallbackGuard cbGuard ( cac.cbMutex );
         epicsGuard < epicsMutex > guard ( cac.mutex );
@@ -720,7 +720,7 @@ int epicsStdCall ca_context_status ( ca_client_context * pcac, unsigned level )
 /*
  * ca_current_context ()
  *
- * used when an auxillary thread needs to join a CA client context started
+ * used when an auxiliary thread needs to join a CA client context started
  * by another thread
  */
 // extern "C"
@@ -740,7 +740,7 @@ struct ca_client_context * epicsStdCall ca_current_context ()
 /*
  * ca_attach_context ()
  *
- * used when an auxillary thread needs to join a CA client context started
+ * used when an auxiliary thread needs to join a CA client context started
  * by another thread
  */
 // extern "C"
diff --git a/modules/ca/src/client/acctst.c b/modules/ca/src/client/acctst.c
index 83d848f12..34298680c 100644
--- a/modules/ca/src/client/acctst.c
+++ b/modules/ca/src/client/acctst.c
@@ -494,7 +494,7 @@ void verifyConnectionHandlerConnect ( appChan *pChans, unsigned chanCount,
 /*
  * verifyBlockingConnect ()
  *
- * 1) verify that we dont print a disconnect message when
+ * 1) verify that we don't print a disconnect message when
  * we delete the last channel
  *
  * 2) verify that we delete the connection to the IOC
@@ -645,7 +645,7 @@ void verifyBlockingConnect ( appChan *pChans, unsigned chanCount,
         status = ca_pend_io ( 1e-16 );
         if ( status == ECA_TIMEOUT ) {
             /*
-             * we end up here if the channel isnt on the same host
+             * we end up here if the channel isn't on the same host
              */
             epicsThreadSleep ( 0.1 );
             ca_poll ();
@@ -1112,7 +1112,7 @@ void verifyHighThroughputRead ( chid chan, unsigned interestLevel )
     unsigned i;
 
     /*
-     * verify we dont jam up on many uninterrupted
+     * verify we don't jam up on many uninterrupted
      * solicitations
      */
     if ( ca_read_access (chan) ) {
@@ -1152,7 +1152,7 @@ void verifyHighThroughputWrite ( chid chan, unsigned interestLevel  )
 }
 
 /*
- * verify we dont jam up on many uninterrupted
+ * verify we don't jam up on many uninterrupted
  * get callback requests
  */
 void verifyHighThroughputReadCallback ( chid chan, unsigned interestLevel )
@@ -1181,7 +1181,7 @@ void verifyHighThroughputReadCallback ( chid chan, unsigned interestLevel )
 }
 
 /*
- * verify we dont jam up on many uninterrupted
+ * verify we don't jam up on many uninterrupted
  * put callback request
  */
 void verifyHighThroughputWriteCallback ( chid chan, unsigned interestLevel )
@@ -1239,7 +1239,7 @@ void verifyBadString ( chid chan, unsigned interestLevel  )
         verify ( status == ECA_NORMAL );
         if ( strcmp ( stimStr, respStr ) ) {
             printf (
-    "Test fails if stim \"%s\" isnt roughly equiv to resp \"%s\"\n",
+    "Test fails if stim \"%s\" isn't roughly equiv to resp \"%s\"\n",
                 stimStr, respStr);
         }
         showProgressEnd ( interestLevel );
@@ -1395,7 +1395,7 @@ static void multiSubscrDestroyNoLateCallbackThread ( void * pParm )
 
         /*
          * raise the priority of the current thread hoping to improve our
-         * likelyhood of detecting a bug
+         * likelihood of detecting a bug
          */
         priorityOfTestThread = epicsThreadGetPrioritySelf ();
         epicsThreadSetPriority ( epicsThreadGetIdSelf(), epicsThreadPriorityHigh );
@@ -1445,7 +1445,7 @@ static void multiSubscrDestroyNoLateCallbackThread ( void * pParm )
 }
 
 /*
- * verify that, in a preemtive callback mode client, a subscription callback never
+ * verify that, in a preemptive callback mode client, a subscription callback never
  * comes after the subscription is destroyed
  */
 static void multiSubscrDestroyNoLateCallbackTest ( const char *pName, unsigned interestLevel )
@@ -1563,7 +1563,7 @@ void multiSubscriptionDeleteTest ( chid chan, unsigned interestLevel  )
 /*
  * singleSubscriptionDeleteTest
  *
- * verify that we dont fail when we repeatedly create
+ * verify that we don't fail when we repeatedly create
  * and delete only one subscription with a high level of
  * traffic on it
  */
@@ -1617,7 +1617,7 @@ void singleSubscriptionDeleteTest ( chid chan, unsigned interestLevel  )
 /*
  * channelClearWithEventTrafficTest
  *
- * verify that we can delete a channel that has subcriptions
+ * verify that we can delete a channel that has subscriptions
  * attached with heavy update traffic
  */
 void channelClearWithEventTrafficTest ( const char *pName, unsigned interestLevel )
@@ -2481,7 +2481,7 @@ void monitorUpdateTest ( chid chan, unsigned interestLevel )
     showProgress ( interestLevel );
 
     /*
-     * attempt to uncover problems where the last event isnt sent
+     * attempt to uncover problems where the last event isn't sent
      * and hopefully get into a flow control situation
      */
     prevPassCount = 0u;
@@ -2522,7 +2522,7 @@ void monitorUpdateTest ( chid chan, unsigned interestLevel )
             ca_poll (); /* emulate typical GUI */
             for ( j = 0; j < NELEMENTS ( test ); j++ ) {
                 /*
-                 * we shouldnt see old monitors because
+                 * we shouldn't see old monitors because
                  * we resubscribed
                  */
                 verify ( test[j].count <= i + 2 );
@@ -3016,7 +3016,7 @@ void testMultithreadSubscr ( void * pParm )
 }
 
 /*
- * test installation of subscriptions similar to usage paterns
+ * test installation of subscriptions similar to usage patterns
  * employed by modern versions of the sequencer
  */
 void verifyMultithreadSubscr ( const char * pName, unsigned interestLevel )
@@ -3111,7 +3111,7 @@ void fdManagerVerify ( const char * pName, unsigned interestLevel )
     status = ca_flush_io ();
     verify ( status == ECA_NORMAL );
 
-    /* look for infinite loop in fd manager schedualing */
+    /* look for infinite loop in fd manager scheduling */
     epicsTimeGetCurrent ( & begin );
     eventCount = 0u;
     while ( 1 ) {
@@ -3175,7 +3175,7 @@ void verifyConnectWithDisconnectedChannels (
      * we should be able to connect to a valid
      * channel within a reasonable delay even
      * though there is one permanently
-     * diasconnected channel
+     * disconnected channel
      */
     status = ca_pend_io ( timeoutToPendIO );
     verify ( status == ECA_NORMAL );
@@ -3491,7 +3491,7 @@ int acctst ( const char * pName, unsigned interestLevel, unsigned channelCount,
 
     /*
      * CA pend event delay accuracy test
-     * (CA asssumes that search requests can be sent
+     * (CA assumes that search requests can be sent
      * at least every 25 mS on all supported os)
      */
     printf ( "\n" );
diff --git a/modules/ca/src/client/bhe.cpp b/modules/ca/src/client/bhe.cpp
index d7fb77785..3808f061c 100644
--- a/modules/ca/src/client/bhe.cpp
+++ b/modules/ca/src/client/bhe.cpp
@@ -130,8 +130,8 @@ bool bhe::updatePeriod (
     guard.assertIdenticalMutex ( this->mutex );
 
     //
-    // this block is enetered if the beacon was created as a side effect of
-    // creating a connection and so we dont yet know the first beacon time
+    // this block is entered if the beacon was created as a side effect of
+    // creating a connection and so we don't yet know the first beacon time
     // and  sequence number
     //
     if ( this->timeStamp == epicsTime () ) {
@@ -154,7 +154,7 @@ bool bhe::updatePeriod (
         return false;
     }
 
-    // 1) detect beacon duplications due to redundant routes
+    // 1) detect beacon duplication due to redundant routes
     // 2) detect lost beacons due to input queue overrun or damage
     if ( CA_V410 ( protocolRevision ) ) {
         unsigned beaconSeqAdvance;
@@ -175,7 +175,7 @@ bool bhe::updatePeriod (
 
         // throw out sequence numbers that jump forward by only a few numbers
         // (this situation is probably caused by a duplicate route
-        // or a beacon due to input queue overun)
+        // or a beacon due to input queue overrun)
         if ( beaconSeqAdvance > 1 &&  beaconSeqAdvance < 4 ) {
             logBeaconDiscard ( beaconSeqAdvance, currentTime );
             return false;
@@ -244,8 +244,8 @@ bool bhe::updatePeriod (
         /*
          * Is this an IOC seen because of an IOC reboot
          * (beacon come at a higher rate just after the
-         * IOC reboots). Lower tolarance here because we
-         * dont have to worry about lost beacons.
+         * IOC reboots). Lower tolerance here because we
+         * don't have to worry about lost beacons.
          *
          * It may be possible to get false triggers here
          * if the client is busy, but this does not cause
diff --git a/modules/ca/src/client/caProto.h b/modules/ca/src/client/caProto.h
index c6e211c11..57b280177 100644
--- a/modules/ca/src/client/caProto.h
+++ b/modules/ca/src/client/caProto.h
@@ -58,8 +58,8 @@
 #define CA_REPEATER_PORT        (CA_PORT_BASE+CA_MAJOR_PROTOCOL_REVISION*2u+1u)
 
 /*
- * 1500 (max of ethernet and 802.{2,3} MTU) - 20(IP) - 8(UDP)
- * (the MTU of Ethernet is currently independent of its speed varient)
+ * 1500 (max of Ethernet and 802.{2,3} MTU) - 20(IP) - 8(UDP)
+ * (the MTU of Ethernet is currently independent of its speed variant)
  */
 #define ETHERNET_MAX_UDP        ( 1500u - 20u - 8u )
 #define MAX_UDP_RECV            ( 0xffff + 16u ) /* allow large frames to be received in the future */
@@ -117,7 +117,7 @@ typedef ca_uint32_t     caResId;
 
 /*
  * for use with search and not_found (if search fails and
- * its not a broadcast tell the client to look elesewhere)
+ * its not a broadcast tell the client to look elsewhere)
  */
 #define DOREPLY     10u
 #define DONTREPLY   5u
@@ -176,7 +176,7 @@ typedef struct ca_hdr {
 struct  mon_info {
     ca_float32_t    m_lval;     /* low delta */
     ca_float32_t    m_hval;     /* high delta */
-    ca_float32_t    m_toval;    /* period btween samples */
+    ca_float32_t    m_toval;    /* period between samples */
     ca_uint16_t     m_mask;     /* event select mask */
     ca_uint16_t     m_pad;      /* extend to 32 bits */
 };
diff --git a/modules/ca/src/client/ca_client_context.cpp b/modules/ca/src/client/ca_client_context.cpp
index 1c2f985b5..671d1210b 100644
--- a/modules/ca/src/client/ca_client_context.cpp
+++ b/modules/ca/src/client/ca_client_context.cpp
@@ -224,7 +224,7 @@ void ca_client_context::changeExceptionEvent (
     epicsGuard < epicsMutex > guard ( this->mutex );
     this->ca_exception_func = pfunc;
     this->ca_exception_arg = arg;
-// should block here until releated callback in progress completes
+// should block here until related callback in progress completes
 }
 
 void ca_client_context::replaceErrLogHandler (
@@ -237,7 +237,7 @@ void ca_client_context::replaceErrLogHandler (
     else {
         this->pVPrintfFunc = epicsVprintf;
     }
-// should block here until releated callback in progress completes
+// should block here until related callback in progress completes
 }
 
 void ca_client_context::registerForFileDescriptorCallBack (
@@ -252,7 +252,7 @@ void ca_client_context::registerForFileDescriptorCallBack (
         // w/o having sent the wakeup message
         this->_sendWakeupMsg ();
     }
-// should block here until releated callback in progress completes
+// should block here until related callback in progress completes
 }
 
 int ca_client_context :: printFormated (
@@ -768,9 +768,9 @@ LIBCA_API int epicsStdCall ca_clear_subscription ( evid pMon )
       // we will definately stall out here if all of the
       // following are true
       //
-      // o user creates non-preemtive mode client library context
+      // o user creates non-preemptive mode client library context
       // o user doesnt periodically call a ca function
-      // o user calls this function from an auxiillary thread
+      // o user calls this function from an auxiliary thread
       //
       CallbackGuard cbGuard ( cac.cbMutex );
       epicsGuard < epicsMutex > guard ( cac.mutex );
diff --git a/modules/ca/src/client/cac.cpp b/modules/ca/src/client/cac.cpp
index b1abfc42a..f8d1d0800 100644
--- a/modules/ca/src/client/cac.cpp
+++ b/modules/ca/src/client/cac.cpp
@@ -285,7 +285,7 @@ cac::~cac ()
     // this blocks until the UDP thread exits so that
     // it will not sneak in any new clients
     //
-    // lock intentionally not held here so that we dont deadlock
+    // lock intentionally not held here so that we don't deadlock
     // waiting for the UDP thread to exit while it is waiting to
     // get the lock.
     {
@@ -312,7 +312,7 @@ cac::~cac ()
     //
     // wait for all tcp threads to exit
     //
-    // this will block for oustanding sends to go out so dont
+    // this will block for outstanding sends to go out so don't
     // hold a lock while waiting
     //
     {
@@ -411,7 +411,7 @@ void cac::show (
 
     ::printf ( "Channel Access Client Context at %p for user %s\n",
         static_cast <const void *> ( this ), this->pUserName );
-    // this also supresses the "defined, but not used"
+    // this also suppresses the "defined, but not used"
     // warning message
     ::printf ( "\trevision \"%s\"\n", pVersionCAC );
 
diff --git a/modules/ca/src/client/cadef.h b/modules/ca/src/client/cadef.h
index f64e3899c..fc94dfb6c 100644
--- a/modules/ca/src/client/cadef.h
+++ b/modules/ca/src/client/cadef.h
@@ -129,7 +129,7 @@ typedef unsigned CA_SYNC_GID;
 #define CA_OP_CONN_UP       6
 #define CA_OP_CONN_DOWN     7
 
-/* depricated */
+/* deprecated */
 #define CA_OP_SEARCH        2
 
 /*
@@ -464,7 +464,7 @@ LIBCA_API int epicsStdCall ca_array_get_callback
 /*  Specify a function to be executed whenever significant changes      */
 /*  occur to a channel.                                                 */
 /*  NOTES:                                                              */
-/*  1)  Evid may be omited by passing a NULL pointer                    */
+/*  1)  Evid may be omitted by passing a NULL pointer                    */
 /*                                                                      */
 /*  2)  An array count of zero specifies the native db count            */
 /*                                                                      */
@@ -837,7 +837,7 @@ LIBCA_API double epicsStdCall ca_beacon_period (chid chan);
 LIBCA_API double epicsStdCall ca_receive_watchdog_delay (chid chan);
 
 /*
- * used when an auxillary thread needs to join a CA client context started
+ * used when an auxiliary thread needs to join a CA client context started
  * by another thread
  */
 LIBCA_API struct ca_client_context * epicsStdCall ca_current_context ();
diff --git a/modules/ca/src/client/casw.cpp b/modules/ca/src/client/casw.cpp
index 54a14036c..49c45ef3d 100644
--- a/modules/ca/src/client/casw.cpp
+++ b/modules/ca/src/client/casw.cpp
@@ -224,7 +224,7 @@ int main ( int argc, char ** argv )
                  *   always set this field to INADDR_ANY
                  *
                  * clients always assume that if this
-                 * field is set to something that isnt INADDR_ANY
+                 * field is set to something that isn't INADDR_ANY
                  * then it is the overriding IP address of the server.
                  */
                 ina.sin_family = AF_INET;
@@ -235,7 +235,7 @@ int main ( int argc, char ** argv )
                 }
                 else {
                     /*
-                     * old servers dont supply this and the
+                     * old servers don't supply this and the
                      * default port must be assumed
                      */
                     ina.sin_port = htons ( serverPort );
diff --git a/modules/ca/src/client/comBuf.cpp b/modules/ca/src/client/comBuf.cpp
index 8f92170dd..5c9083ed7 100644
--- a/modules/ca/src/client/comBuf.cpp
+++ b/modules/ca/src/client/comBuf.cpp
@@ -45,7 +45,7 @@ bool comBuf::flushToWire ( wireSendAdapter & wire, const epicsTime & currentTime
     return true;
 }
 
-// throwing the exception from a function that isnt inline
+// throwing the exception from a function that isn't inline
 // shrinks the GNU compiled object code
 void comBuf::throwInsufficentBytesException ()
 {
diff --git a/modules/ca/src/client/comQueRecv.cpp b/modules/ca/src/client/comQueRecv.cpp
index 026a84ced..60e142a35 100644
--- a/modules/ca/src/client/comQueRecv.cpp
+++ b/modules/ca/src/client/comQueRecv.cpp
@@ -196,7 +196,7 @@ epicsUInt16 comQueRecv::popUInt16 ()
     if ( ! pComBuf ) {
         comBuf::throwInsufficentBytesException ();
     }
-    // try first for all in one buffer efficent version
+    // try first for all in one buffer efficient version
     epicsUInt16 tmp = 0;
     comBuf::popStatus status = pComBuf->pop ( tmp );
     if ( status.success ) {
@@ -215,7 +215,7 @@ epicsUInt32 comQueRecv::popUInt32 ()
     if ( ! pComBuf ) {
         comBuf::throwInsufficentBytesException ();
     }
-    // try first for all in one buffer efficent version
+    // try first for all in one buffer efficient version
     epicsUInt32 tmp = 0;
     comBuf::popStatus status = pComBuf->pop ( tmp );
     if ( status.success ) {
@@ -230,7 +230,7 @@ epicsUInt32 comQueRecv::popUInt32 ()
 
 bool comQueRecv::popOldMsgHeader ( caHdrLargeArray & msg )
 {
-    // try first for all in one buffer efficent version
+    // try first for all in one buffer efficient version
     comBuf * pComBuf = this->bufs.first ();
     if ( ! pComBuf ) {
         return false;
diff --git a/modules/ca/src/client/comQueSend.cpp b/modules/ca/src/client/comQueSend.cpp
index e782a7017..c0c535f42 100644
--- a/modules/ca/src/client/comQueSend.cpp
+++ b/modules/ca/src/client/comQueSend.cpp
@@ -27,17 +27,17 @@
 // 1) Allow sufficent headroom so that users will be able to perform
 // a reasonable amount of IO within CA callbacks without experiencing
 // a push/pull deadlock. If a potential push/pull deadlock situation
-// occurs then detect and avoid it and provide diagnotic to the user
+// occurs then detect and avoid it and provide diagnostic to the user
 // via special status.
-// 2) Return status to the user when there is insufficent memory to
+// 2) Return status to the user when there is insufficient memory to
 // queue a complete message.
 // 3) return status to the user when a message cant be flushed because
 // a connection dropped.
-// 4) Do not allocate too much memory in exception situatons (such as
+// 4) Do not allocate too much memory in exception situations (such as
 // after a circuit disconnect).
 // 5) Avoid allocating more memory than is absolutely necessary to meet
 // the above requirements.
-// 6) Message fragments must never be sent to the IOC when there isnt
+// 6) Message fragments must never be sent to the IOC when there isn't
 // enough memory to queue part of a message (we also must not force
 // a disconnect because the client is starved for memory).
 // 7) avoid the need to check status for each byte pushed into the
@@ -45,7 +45,7 @@
 //
 // Implementation:
 // 1) When queuing a complete message, first test to see if a flush is
-// required. If it is a receive thread scheduals the flush with the
+// required. If it is a receive thread schedules the flush with the
 // send thread, and otherwise directly execute the system call. The
 // send thread must run at a higher priority than the receive thread
 // if we are to minimize memory consumption.
@@ -58,9 +58,9 @@
 //      a) A user is queuing more requests that demand a response from a
 //      callback than are removed by the response that initiated the
 //      callback, and this situation persists for many callbacks until
-//      all buffering in the system is exausted.
+//      all buffering in the system is exhausted.
 //      b) A user is queuing many requests that demand a response from one
-//      callback until all buffering in the system is exausted.
+//      callback until all buffering in the system is exhausted.
 //      c) Some combination of both (a) nad (b).
 //
 //
diff --git a/modules/ca/src/client/convert.cpp b/modules/ca/src/client/convert.cpp
index e043ee2fe..361b60222 100644
--- a/modules/ca/src/client/convert.cpp
+++ b/modules/ca/src/client/convert.cpp
@@ -35,7 +35,7 @@
 #include "caerr.h"
 
 /*
- * NOOP if this isnt required
+ * NOOP if this isn't required
  */
 #ifdef EPICS_CONVERSION_REQUIRED
 
@@ -326,7 +326,7 @@ arrayElementCount   num         /* number of values     */
 **      int  encode;            boolean, if true vax to ieee
 **                           else ieee to vax
 **
-**  converts fields ofstruct in HOST format to ieee format
+**  converts fields of struct in HOST format to ieee format
 **     or
 **  converts fields of struct in NET format to fields with HOST
 **      format
@@ -1022,7 +1022,7 @@ arrayElementCount   num         /* number of values     */
 **      int  encode;            boolean, if true vax to ieee
 **                           else ieee to vax
 **
-**  converts fields ofstruct in HOST format to ieee format
+**  converts fields of struct in HOST format to ieee format
 **     or
 **  converts fields of struct in NET format to fields with HOST
 **      format
@@ -1056,7 +1056,7 @@ arrayElementCount   num         /* number of values     */
 /****************************************************************************
 **  cvrt_sts_long(s,d)
 **
-**  converts fields ofstruct in HOST format to ieee format
+**  converts fields of struct in HOST format to ieee format
 **     or
 **  converts fields of struct in NET format to fields with HOST
 **      format
@@ -1118,7 +1118,7 @@ arrayElementCount   num         /* number of values     */
 /****************************************************************************
 **  cvrt_time_short(s,d)
 **
-**  converts fields ofstruct in HOST format to ieee format
+**  converts fields of struct in HOST format to ieee format
 **     or
 **  converts fields of struct in NET format to fields with HOST
 **      format
@@ -1239,7 +1239,7 @@ arrayElementCount   num         /* number of values     */
 /****************************************************************************
 **  cvrt_sts_char(s,d)
 **
-**  converts fields ofstruct in HOST format to ieee format
+**  converts fields of struct in HOST format to ieee format
 **     or
 **  converts fields of struct in NET format to fields with HOST
 **      format
@@ -1274,7 +1274,7 @@ arrayElementCount   num         /* number of values     */
 /****************************************************************************
 **  cvrt_time_long(s,d)
 **
-**  converts fields ofstruct in HOST format to ieee format
+**  converts fields of struct in HOST format to ieee format
 **     or
 **  converts fields of struct in NET format to fields with HOST
 **      format
@@ -1325,7 +1325,7 @@ arrayElementCount   num         /* number of values     */
     for(i=0; i<num; i++){
         *pDest = dbr_ntohs( *pSrc );
         /*
-         * dont increment these inside the MACRO
+         * don't increment these inside the MACRO
          */
         pDest++;
         pSrc++;
diff --git a/modules/ca/src/client/db_access.h b/modules/ca/src/client/db_access.h
index c13977e51..3ab92fbc0 100644
--- a/modules/ca/src/client/db_access.h
+++ b/modules/ca/src/client/db_access.h
@@ -123,7 +123,7 @@ typedef epicsOldString dbr_class_name_t;
 LIBCA_API extern const int epicsTypeToDBR_XXXX [lastEpicsType+1];
 
 /*
- * The DBR_XXXX types are indicies into this array
+ * The DBR_XXXX types are indices into this array
  */
 LIBCA_API extern const epicsType DBR_XXXXToEpicsType [LAST_BUFFER_TYPE+1];
 
diff --git a/modules/ca/src/client/hostNameCache.cpp b/modules/ca/src/client/hostNameCache.cpp
index cc109009c..efed41e3d 100644
--- a/modules/ca/src/client/hostNameCache.cpp
+++ b/modules/ca/src/client/hostNameCache.cpp
@@ -53,7 +53,7 @@ void hostNameCache::transactionComplete ( const char * pHostNameIn )
 {
     epicsGuard < epicsMutex > guard ( this->mutex );
     // a few legacy clients have a direct pointer to this buffer so we
-    // set the entrire string to nill terminators before we start copying
+    // set the entire string to nill terminators before we start copying
     // in the name (this reduces the chance that another thread will see
     // garbage characters).
     size_t newNameLen = strlen ( pHostNameIn );
diff --git a/modules/ca/src/client/iocinf.cpp b/modules/ca/src/client/iocinf.cpp
index 7a0853f00..b2c30f7f9 100644
--- a/modules/ca/src/client/iocinf.cpp
+++ b/modules/ca/src/client/iocinf.cpp
@@ -189,7 +189,7 @@ extern "C" void epicsStdCall configureChannelAccessAddressList
     int             yes;
 
     /*
-     * dont load the list twice
+     * don't load the list twice
      */
     assert ( ellCount (pList) == 0 );
 
diff --git a/modules/ca/src/client/iocinf.h b/modules/ca/src/client/iocinf.h
index ae775241d..0dadf44b0 100644
--- a/modules/ca/src/client/iocinf.h
+++ b/modules/ca/src/client/iocinf.h
@@ -56,7 +56,7 @@ static const double CA_CONN_VERIFY_PERIOD = 30.0; /* (sec) how often to request
  * monitor flow control
  *
  * turning this down effects maximum throughput
- * because we dont get an optimal number of bytes
+ * because we don't get an optimal number of bytes
  * per network frame
  */
 static const unsigned contiguousMsgCountWhichTriggersFlowControl = 10u;
diff --git a/modules/ca/src/client/msgForMultiplyDefinedPV.cpp b/modules/ca/src/client/msgForMultiplyDefinedPV.cpp
index f65b392ef..63c00d108 100644
--- a/modules/ca/src/client/msgForMultiplyDefinedPV.cpp
+++ b/modules/ca/src/client/msgForMultiplyDefinedPV.cpp
@@ -57,7 +57,7 @@ void msgForMultiplyDefinedPV::transactionComplete ( const char * pHostNameRej )
     // calls into cac for the notification
     // the msg object (= this) is being deleted as part of the notification
     this->cb.pvMultiplyDefinedNotify ( *this, this->channel, this->acc, pHostNameRej );
-    // !! dont touch 'this' pointer after this point because object has been deleted !!
+    // !! don't touch 'this' pointer after this point because object has been deleted !!
 }
 
 void * msgForMultiplyDefinedPV::operator new ( size_t size,
diff --git a/modules/ca/src/client/nciu.cpp b/modules/ca/src/client/nciu.cpp
index 61ccebafc..a862cb228 100644
--- a/modules/ca/src/client/nciu.cpp
+++ b/modules/ca/src/client/nciu.cpp
@@ -147,14 +147,14 @@ void nciu::connect ( unsigned nativeType,
             guard, this->accessRightState );
     }
 
-    // channel uninstal routine grabs the callback lock so
+    // channel uninstall routine grabs the callback lock so
     // a channel will not be deleted while a call back is
     // in progress
     //
     // the callback lock is also taken when a channel
     // disconnects to prevent a race condition with the
     // code below - ie we hold the callback lock here
-    // so a chanel cant be destroyed out from under us.
+    // so a channel cant be destroyed out from under us.
     this->notify().connectNotify ( guard );
 }
 
diff --git a/modules/ca/src/client/netIO.h b/modules/ca/src/client/netIO.h
index 2560663ba..e5b5814bc 100644
--- a/modules/ca/src/client/netIO.h
+++ b/modules/ca/src/client/netIO.h
@@ -32,7 +32,7 @@
 // destructor is virtual (therefore it is protected).
 // I assume that SUNPRO will fix this in future versions.
 // With other compilers we get warnings (and
-// potential problems) if we dont make the baseNMIU
+// potential problems) if we don't make the baseNMIU
 // destructor virtual.
 #if defined ( __SUNPRO_CC ) && ( __SUNPRO_CC <= 0x540 )
 #   define NETIO_VIRTUAL_DESTRUCTOR
diff --git a/modules/ca/src/client/oldAccess.h b/modules/ca/src/client/oldAccess.h
index cace26ec1..2c39d2768 100644
--- a/modules/ca/src/client/oldAccess.h
+++ b/modules/ca/src/client/oldAccess.h
@@ -591,16 +591,16 @@ void ca_client_context :: whenThereIsAnExceptionDestroySyncGroupIO (
         io.destroy ( *this->pCallbackGuard.get(), guard );
     }
     else {
-        // dont reverse the lock hierarchy
+        // don't reverse the lock hierarchy
         epicsGuardRelease < epicsMutex > guardRelease ( guard );
         {
             //
             // we will definately stall out here if all of the
             // following are true
             //
-            // o user creates non-preemtive mode client library context
+            // o user creates non-preemptive mode client library context
             // o user doesnt periodically call a ca function
-            // o user calls this function from an auxiillary thread
+            // o user calls this function from an auxiliary thread
             //
             CallbackGuard cbGuard ( this->cbMutex );
             epicsGuard < epicsMutex > guard ( this->mutex );
diff --git a/modules/ca/src/client/oldChannelNotify.cpp b/modules/ca/src/client/oldChannelNotify.cpp
index 0716a430b..71688c94c 100644
--- a/modules/ca/src/client/oldChannelNotify.cpp
+++ b/modules/ca/src/client/oldChannelNotify.cpp
@@ -571,7 +571,7 @@ int epicsStdCall ca_create_subscription (
             oldSubscription  (
                 guard, *pChan, pChan->io, tmpType, count, mask,
                 pCallBack, pCallBackArg, monixptr );
-        // dont touch object created after above new because
+        // don't touch object created after above new because
         // the first callback might have canceled, and therefore
         // destroyed, it
         return ECA_NORMAL;
diff --git a/modules/ca/src/client/oldSubscription.cpp b/modules/ca/src/client/oldSubscription.cpp
index b1290b2b8..72a51d9ad 100644
--- a/modules/ca/src/client/oldSubscription.cpp
+++ b/modules/ca/src/client/oldSubscription.cpp
@@ -41,7 +41,7 @@ oldSubscription::oldSubscription  (
         *pEventId = this;
     }
     io.subscribe ( guard, type, nElem, mask, *this, &this->id );
-    // Dont touch this pointer after this point because the
+    // Don't touch this pointer after this point because the
     // 1st update callback might cancel the subscription and
     // thereby destroy this object.
 }
diff --git a/modules/ca/src/client/repeater.cpp b/modules/ca/src/client/repeater.cpp
index e597d66f6..e198a25d4 100644
--- a/modules/ca/src/client/repeater.cpp
+++ b/modules/ca/src/client/repeater.cpp
@@ -79,7 +79,7 @@
 
 /*
  *  these can be external since there is only one instance
- *  per machine so we dont care about reentrancy
+ *  per machine so we don't care about reentrancy
  */
 static tsDLList < repeaterClient > client_list;
 
@@ -335,7 +335,7 @@ static void fanOut ( const osiSockAddr & from, const void * pMsg,
 
     while ( ( pclient = client_list.get () ) ) {
         theClients.add ( *pclient );
-        /* Dont reflect back to sender */
+        /* Don't reflect back to sender */
         if ( pclient->identicalAddress ( from ) ) {
             continue;
         }
@@ -392,7 +392,7 @@ static void register_new_client ( osiSockAddr & from,
          * repeater would not always allow the loopback address
          * as a local client address so current clients alternate
          * between the address of the first non-loopback interface
-         * found and the loopback addresss when subscribing with
+         * found and the loopback address when subscribing with
          * the CA repeater until all CA repeaters have been updated
          * to current code.
          */
@@ -452,7 +452,7 @@ static void register_new_client ( osiSockAddr & from,
     }
 
     /*
-     * send a noop message to all other clients so that we dont
+     * send a noop message to all other clients so that we don't
      * accumulate sockets when there are no beacons
      */
     caHdr noop;
diff --git a/modules/ca/src/client/searchTimer.cpp b/modules/ca/src/client/searchTimer.cpp
index 5a4fa446a..affa352b7 100644
--- a/modules/ca/src/client/searchTimer.cpp
+++ b/modules/ca/src/client/searchTimer.cpp
@@ -317,7 +317,7 @@ void searchTimer :: show ( unsigned level ) const
 
 //
 // Reset the delay to the next search request if we get
-// at least one response. However, dont reset this delay if we
+// at least one response. However, don't reset this delay if we
 // get a delayed response to an old search request.
 //
 void searchTimer::uninstallChanDueToSuccessfulSearchResponse (
diff --git a/modules/ca/src/client/searchTimer.h b/modules/ca/src/client/searchTimer.h
index 74c8bde6e..ca5d2c55d 100644
--- a/modules/ca/src/client/searchTimer.h
+++ b/modules/ca/src/client/searchTimer.h
@@ -82,8 +82,8 @@ private:
     double framesPerTry; /* # of UDP frames per search try */
     double framesPerTryCongestThresh; /* one half N tries w congest */
     unsigned retry;
-    unsigned searchAttempts; /* num search tries after last timer experation */
-    unsigned searchResponses; /* num search resp after last timer experation */
+    unsigned searchAttempts; /* num search tries after last timer expiration */
+    unsigned searchResponses; /* num search resp after last timer expiration */
     const unsigned index;
     ca_uint32_t dgSeqNoAtTimerExpireBegin;
     ca_uint32_t dgSeqNoAtTimerExpireEnd;
diff --git a/modules/ca/src/client/syncgrp.cpp b/modules/ca/src/client/syncgrp.cpp
index bee6ea8dc..4f79348fd 100644
--- a/modules/ca/src/client/syncgrp.cpp
+++ b/modules/ca/src/client/syncgrp.cpp
@@ -82,9 +82,9 @@ extern "C" int epicsStdCall ca_sg_delete ( const CA_SYNC_GID gid )
           // we will definately stall out here if all of the
           // following are true
           //
-          // o user creates non-preemtive mode client library context
+          // o user creates non-preemptive mode client library context
           // o user doesnt periodically call a ca function
-          // o user calls this function from an auxiillary thread
+          // o user calls this function from an auxiliary thread
           //
           CallbackGuard cbGuard ( pcac->cbMutex );
           epicsGuard < epicsMutex > guard ( pcac->mutex );
@@ -106,9 +106,9 @@ void sync_group_reset ( ca_client_context & client, CASG & sg )
         // we will definately stall out here if all of the
         // following are true
         //
-        // o user creates non-preemtive mode client library context
+        // o user creates non-preemptive mode client library context
         // o user doesnt periodically call a ca function
-        // o user calls this function from an auxiillary thread
+        // o user calls this function from an auxiliary thread
         //
         CallbackGuard cbGuard ( client.cbMutex );
         epicsGuard < epicsMutex > guard ( client.mutex );
@@ -219,9 +219,9 @@ extern "C" int epicsStdCall ca_sg_test ( const CA_SYNC_GID gid )
               // we will definately stall out here if all of the
               // following are true
               //
-              // o user creates non-preemtive mode client library context
+              // o user creates non-preemptive mode client library context
               // o user doesnt periodically call a ca function
-              // o user calls this function from an auxiillary thread
+              // o user calls this function from an auxiliary thread
               //
               CallbackGuard cbGuard ( pcac->cbMutex );
               epicsGuard < epicsMutex > guard ( pcac->mutex );
diff --git a/modules/ca/src/client/tcpRecvWatchdog.cpp b/modules/ca/src/client/tcpRecvWatchdog.cpp
index 9e0bf0188..367e09237 100644
--- a/modules/ca/src/client/tcpRecvWatchdog.cpp
+++ b/modules/ca/src/client/tcpRecvWatchdog.cpp
@@ -176,7 +176,7 @@ void tcpRecvWatchdog::sendBacklogProgressNotify (
 {
     guard.assertIdenticalMutex ( this->mutex );
 
-    // We dont set "beaconAnomaly" to be false here because, after we see a
+    // We don't set "beaconAnomaly" to be false here because, after we see a
     // beacon anomaly (which could be transiently detecting a reboot) we will
     // not trust the beacon as an indicator of a healthy server until we
     // receive at least one message from the server.
diff --git a/modules/ca/src/client/tcpiiu.cpp b/modules/ca/src/client/tcpiiu.cpp
index e601c8d24..a8b04a2f7 100644
--- a/modules/ca/src/client/tcpiiu.cpp
+++ b/modules/ca/src/client/tcpiiu.cpp
@@ -81,7 +81,7 @@ void tcpSendThread::run ()
 
         while ( true ) {
 
-            // dont wait if there is still labor to be done below
+            // don't wait if there is still labor to be done below
             if ( ! laborPending ) {
                 epicsGuardRelease < epicsMutex > unguard ( guard );
                 this->iiu.sendThreadFlushEvent.wait ();
@@ -124,7 +124,7 @@ void tcpSendThread::run ()
                 }
                 else {
                     // This wakes up the resp thread so that it can call
-                    // the connect callback. This isnt maximally efficent
+                    // the connect callback. This isn't maximally efficient
                     // but it has the excellent side effect of not requiring
                     // that the UDP thread take the callback lock. There are
                     // almost no V42 servers left at this point.
@@ -204,7 +204,7 @@ void tcpSendThread::run ()
 
     while ( ! this->iiu.recvThread.exitWait ( 30.0 ) ) {
         // it is possible to get stuck here if the user calls
-        // ca_context_destroy() when a circuit isnt known to
+        // ca_context_destroy() when a circuit isn't known to
         // be unresponsive, but is. That situation is probably
         // rare, and the IP kernel might have a timeout for
         // such situations, nevertheless we will attempt to deal
@@ -322,7 +322,7 @@ void tcpiiu::recvBytes (
                 return;
             }
 
-            // if the circuit was locally aborted then supress
+            // if the circuit was locally aborted then suppress
             // warning messages about bad file descriptor etc
             if ( this->state != iiucs_connected &&
                     this->state != iiucs_clean_shutdown ) {
@@ -358,9 +358,9 @@ void tcpiiu::recvBytes (
             epicsSocketConvertErrnoToString (
                 sockErrBuf, sizeof ( sockErrBuf ) );
 
-            // the replacable printf handler isnt called here
-            // because it reqires a callback lock which probably
-            // isnt appropriate here
+            // the replaceable printf handler isn't called here
+            // because it requires a callback lock which probably
+            // isn't appropriate here
             char name[64];
             this->hostNameCacheInstance.getName (
                 name, sizeof ( name ) );
@@ -535,11 +535,11 @@ void tcpRecvThread::run ()
             }
 
             //
-            // we dont feel comfortable calling this with a lock applied
+            // we don't feel comfortable calling this with a lock applied
             // (it might block for longer than we like)
             //
-            // we would prefer to improve efficency by trying, first, a
-            // recv with the new MSG_DONTWAIT flag set, but there isnt
+            // we would prefer to improve efficiency by trying, first, a
+            // recv with the new MSG_DONTWAIT flag set, but there isn't
             // universal support
             //
             bool bytesArePending = this->iiu.bytesArePendingInOS ();
@@ -1002,7 +1002,7 @@ void tcpiiu::initiateAbortShutdown (
         };
 
         //
-        // wake up the send thread if it isnt blocking in send()
+        // wake up the send thread if it isn't blocking in send()
         //
         this->sendThreadFlushEvent.signal ();
         this->flushBlockEvent.signal ();
@@ -1580,7 +1580,7 @@ void tcpiiu::subscriptionRequest (
         maxBytes = MAX_TCP;
     }
     unsigned dataType = subscr.getType ( guard );
-    // data type bounds checked when sunscription created
+    // data type bounds checked when subscription created
     arrayElementCount maxElem = ( maxBytes - dbr_size[dataType] ) / dbr_value_size[dataType];
     if ( nElem > maxElem ) {
         throw cacChannel::msgBodyCacheTooSmall ();
@@ -1633,7 +1633,7 @@ void tcpiiu::subscriptionUpdateRequest (
         throw cacChannel::msgBodyCacheTooSmall ();
     }
     comQueSendMsgMinder minder ( this->sendQue, guard );
-    // nElem boounds checked above
+    // nElem bounds checked above
     this->sendQue.insertRequestHeader (
         CA_PROTO_READ_NOTIFY, 0u,
         static_cast < ca_uint16_t > ( dataType ),
@@ -1712,7 +1712,7 @@ void tcpiiu :: flush ( epicsGuard < epicsMutex > & guard )
     this->flushRequest ( guard );
     // the process thread is not permitted to flush as this
     // can result in a push / pull deadlock on the TCP pipe.
-    // Instead, the process thread scheduals the flush with the
+    // Instead, the process thread schedules the flush with the
     // send thread which runs at a higher priority than the
     // receive thread. The same applies to the UDP thread for
     // locking hierarchy reasons.
@@ -1817,7 +1817,7 @@ void tcpiiu::disconnectAllChannels (
     }
 
     while ( nciu * pChan = this->createRespPend.get () ) {
-        // we dont yet know the server's id so we cant
+        // we don't yet know the server's id so we cant
         // send a channel delete request and will instead
         // trust that the server can do the proper cleanup
         // when the circuit disconnects
@@ -1848,7 +1848,7 @@ void tcpiiu::disconnectAllChannels (
 
     while ( nciu * pChan = this->unrespCircuit.get () ) {
         // if we know that the circuit is unresponsive
-        // then we dont send a channel delete request and
+        // then we don't send a channel delete request and
         // will instead trust that the server can do the
         // proper cleanup when the circuit disconnects
         pChan->disconnectAllIO ( cbGuard, guard );
@@ -1883,7 +1883,7 @@ void tcpiiu::unlinkAllChannels (
     while ( nciu * pChan = this->createRespPend.get () ) {
         pChan->channelNode::listMember =
             channelNode::cs_none;
-        // we dont yet know the server's id so we cant
+        // we don't yet know the server's id so we cant
         // send a channel delete request and will instead
         // trust that the server can do the proper cleanup
         // when the circuit disconnects
@@ -1921,7 +1921,7 @@ void tcpiiu::unlinkAllChannels (
             channelNode::cs_none;
         pChan->disconnectAllIO ( cbGuard, guard );
         // if we know that the circuit is unresponsive
-        // then we dont send a channel delete request and
+        // then we don't send a channel delete request and
         // will instead trust that the server can do the
         // proper cleanup when the circuit disconnects
         pChan->serviceShutdownNotify ( cbGuard, guard );
@@ -1951,7 +1951,7 @@ void tcpiiu::installChannel (
     this->channelCountTot++;
     chan.channelNode::listMember = channelNode::cs_createReqPend;
     chan.searchReplySetUp ( *this, sidIn, typeIn, countIn, guard );
-    // The tcp send thread runs at apriority below the udp thread
+    // The tcp send thread runs at a priority below the udp thread
     // so that this will not send small packets
     this->sendThreadFlushEvent.signal ();
 }
@@ -2060,7 +2060,7 @@ bool tcpiiu::bytesArePendingInOS () const
     }
     return false;
 #else
-    osiSockIoctl_t bytesPending = 0; /* shut up purifys yapping */
+    osiSockIoctl_t bytesPending = 0; /* shut up Purify's yapping */
     int status = socket_ioctl ( this->sock,
                             FIONREAD, & bytesPending );
     if ( status >= 0 ) {
diff --git a/modules/ca/src/client/test/ca_test.c b/modules/ca/src/client/test/ca_test.c
index 0d1ec2f57..adae20b84 100644
--- a/modules/ca/src/client/test/ca_test.c
+++ b/modules/ca/src/client/test/ca_test.c
@@ -279,7 +279,7 @@ skip_rest:
 
     /*
      * wait for the operation to complete
-     * (outstabnding decrements to zero)
+     * (outstanding decrements to zero)
      */
     while(ntries){
         ca_pend_event(1.0);
diff --git a/modules/ca/src/client/udpiiu.cpp b/modules/ca/src/client/udpiiu.cpp
index 723117a71..1b299278c 100644
--- a/modules/ca/src/client/udpiiu.cpp
+++ b/modules/ca/src/client/udpiiu.cpp
@@ -536,9 +536,9 @@ void epicsStdCall caRepeaterRegistrationMessage (
     if ( status < 0 ) {
         int errnoCpy = SOCKERRNO;
         /*
-         * Different OS return different codes when the repeater isnt running.
-         * Its ok to supress these messages because I print another warning message
-         * if we time out registerring with the repeater.
+         * Different OS return different codes when the repeater isn't running.
+         * Its ok to suppress these messages because I print another warning message
+         * if we time out registering with the repeater.
          *
          * Linux returns SOCK_ECONNREFUSED
          * Windows 2000 returns SOCK_ECONNRESET
@@ -673,7 +673,7 @@ bool udpiiu :: searchRespAction (
     const epicsTime & currentTime )
 {
     /*
-     * we dont currently know what to do with channel's
+     * we don't currently know what to do with channel's
      * found to be at non-IP type addresses
      */
     if ( addr.sa.sa_family != AF_INET ) {
@@ -762,7 +762,7 @@ bool udpiiu::beaconAction (
      *   always set this field to INADDR_ANY
      *
      * clients always assume that if this
-     * field is set to something that isnt INADDR_ANY
+     * field is set to something that isn't INADDR_ANY
      * then it is the overriding IP address of the server.
      */
     ina.sin_family = AF_INET;
@@ -772,7 +772,7 @@ bool udpiiu::beaconAction (
     }
     else {
         /*
-         * old servers dont supply this and the
+         * old servers don't supply this and the
          * default port must be assumed
          */
         ina.sin_port = htons ( this->serverPort );
@@ -874,7 +874,7 @@ void udpiiu::postMsg (
         size = pCurMsg->m_postsize + sizeof ( *pCurMsg );
 
         /*
-         * dont allow msg body extending beyond frame boundary
+         * don't allow msg body extending beyond frame boundary
          */
         if ( size > blockSize ) {
             char buf[64];
@@ -1044,7 +1044,7 @@ void udpiiu :: SearchRespCallback :: notify (
         const osiSockAddr & addr, const epicsTime & currentTime )
 {
     /*
-     * we dont currently know what to do with channel's
+     * we don't currently know what to do with channel's
      * found to be at non-IP type addresses
      */
     if ( addr.sa.sa_family != AF_INET ) {
@@ -1119,7 +1119,7 @@ bool udpiiu :: datagramFlush (
 {
     guard.assertIdenticalMutex ( cacMutex );
 
-    // dont send the version header by itself
+    // don't send the version header by itself
     if ( this->nBytesInXmitBuf <= sizeof ( caHdr ) ) {
         return false;
     }
diff --git a/modules/ca/src/tools/caget.c b/modules/ca/src/tools/caget.c
index 0aa655ee5..e60f61922 100644
--- a/modules/ca/src/tools/caget.c
+++ b/modules/ca/src/tools/caget.c
@@ -256,7 +256,7 @@ static int caget (pv *pvs, int nPvs, RequestT request, OutputT format,
     for (n = 0; n < nPvs; n++) {
 
         switch (format) {
-        case plain:             /* Emulate old caget behaviour */
+        case plain:             /* Emulate old caget behavior */
             if (pvs[n].nElems <= 1 && fieldSeparator == ' ') printf("%-30s", pvs[n].name);
             else                                               printf("%s", pvs[n].name);
             printf("%c", fieldSeparator);
diff --git a/modules/ca/src/tools/caput.c b/modules/ca/src/tools/caput.c
index 62def624e..05247643a 100644
--- a/modules/ca/src/tools/caput.c
+++ b/modules/ca/src/tools/caput.c
@@ -192,7 +192,7 @@ int caget (pv *pvs, int nPvs, OutputT format,
     for (n = 0; n < nPvs; n++) {
 
         switch (format) {
-        case plain:             /* Emulate old caput behaviour */
+        case plain:             /* Emulate old caput behavior */
             if (pvs[n].reqElems <= 1 && fieldSeparator == ' ') printf("%-30s", pvs[n].name);
             else                                               printf("%s", pvs[n].name);
             printf("%c", fieldSeparator);
diff --git a/modules/database/src/ioc/db/dbAccess.c b/modules/database/src/ioc/db/dbAccess.c
index 8aac52f00..f395e2fb9 100644
--- a/modules/database/src/ioc/db/dbAccess.c
+++ b/modules/database/src/ioc/db/dbAccess.c
@@ -529,7 +529,7 @@ long dbProcess(dbCommon *precord)
         }
     }
 
-    /* If already active dont process */
+    /* If already active don't process */
     if (precord->pact) {
         unsigned short monitor_mask;
 
@@ -931,7 +931,7 @@ long dbGet(DBADDR *paddr, short dbrType,
         no_elements = capacity = pfl->no_elements;
     }
 
-    /* Update field info from record (if neccessary);
+    /* Update field info from record (if necessary);
      * may modify paddr->pfield.
      */
     if (!dbfl_has_copy(pfl) &&
diff --git a/modules/database/src/ioc/db/dbAccessDefs.h b/modules/database/src/ioc/db/dbAccessDefs.h
index 771084170..eef5e990b 100644
--- a/modules/database/src/ioc/db/dbAccessDefs.h
+++ b/modules/database/src/ioc/db/dbAccessDefs.h
@@ -73,7 +73,7 @@ DBCORE_API extern int dbAccessDebugPUTF;
  *      options has a bit set for each option that was accepted
  *      number_elements is actual number of elements obtained
  *
- * The individual items can be refered to by the expressions::
+ * The individual items can be referred to by the expressions::
  *
  * buffer.status
  * buffer.severity
diff --git a/modules/database/src/ioc/db/dbBkpt.c b/modules/database/src/ioc/db/dbBkpt.c
index a32ebab4e..de6fa3f9b 100644
--- a/modules/database/src/ioc/db/dbBkpt.c
+++ b/modules/database/src/ioc/db/dbBkpt.c
@@ -97,7 +97,7 @@ static long FIND_CONT_NODE(
  *    processing in that lockset to this task.  The separate task is
  *    used so that locksets that do not have breakpoints are isolated
  *    from locksets that do.  This allows the processing of other
- *    locksets to continue uninterupted, even if they exist on the same
+ *    locksets to continue uninterrupted, even if they exist on the same
  *    scan list as a lockset containing a breakpoint.
  *
  *  An entrypoint is the first record that gets processed in a lockset.
@@ -250,7 +250,7 @@ static long FIND_CONT_NODE(
 }
 
 /*
- *  Initialise the breakpoint stack
+ *  Initialize the breakpoint stack
  */
 void dbBkptInit(void)
 {
diff --git a/modules/database/src/ioc/db/dbConstLink.c b/modules/database/src/ioc/db/dbConstLink.c
index 282493992..03f64e289 100644
--- a/modules/database/src/ioc/db/dbConstLink.c
+++ b/modules/database/src/ioc/db/dbConstLink.c
@@ -63,7 +63,7 @@ cvt_st_ ## TYPE(const char *from, void *pfield, const dbAddr *paddr) { \
     return epicsParse##TYPE(from, to, 0, &end); \
 }
 
-/* Instanciate for CHAR, UCHAR, SHORT, USHORT and LONG */
+/* Instantiate for CHAR, UCHAR, SHORT, USHORT and LONG */
 cvt_st_int(Int8)
 cvt_st_int(UInt8)
 cvt_st_int(Int16)
@@ -99,7 +99,7 @@ static long cvt_st_UInt32(const char *from, void *pfield, const dbAddr *paddr)
     return status;
 }
 
-/* Instanciate for INT64 and UINT64 */
+/* Instantiate for INT64 and UINT64 */
 cvt_st_int(Int64)
 cvt_st_int(UInt64)
 
@@ -117,7 +117,7 @@ cvt_st_ ## TYPE(const char *from, void *pfield, const dbAddr *paddr) { \
     return epicsParse##TYPE(from, to, &end); \
 }
 
-/* Instanciate for FLOAT32 and FLOAT64 */
+/* Instantiate for FLOAT32 and FLOAT64 */
 cvt_st_float(Float32)
 cvt_st_float(Float64)
 
diff --git a/modules/database/src/ioc/db/dbContextReadNotifyCache.cpp b/modules/database/src/ioc/db/dbContextReadNotifyCache.cpp
index efcfa1d74..1c5e0d0f9 100644
--- a/modules/database/src/ioc/db/dbContextReadNotifyCache.cpp
+++ b/modules/database/src/ioc/db/dbContextReadNotifyCache.cpp
@@ -9,7 +9,7 @@
 \*************************************************************************/
 
 /*
- * Auther Jeff Hill
+ * Author Jeff Hill
  */
 
 #include <stdlib.h>
diff --git a/modules/database/src/ioc/db/dbConvertJSON.h b/modules/database/src/ioc/db/dbConvertJSON.h
index e01ad29aa..045bd937b 100644
--- a/modules/database/src/ioc/db/dbConvertJSON.h
+++ b/modules/database/src/ioc/db/dbConvertJSON.h
@@ -16,7 +16,7 @@
 extern "C" {
 #endif
 
-/* This name should probably be changed to inclue "array" */
+/* This name should probably be changed to include "array" */
 DBCORE_API long dbPutConvertJSON(const char *json, short dbrType,
     void *pdest, long *psize);
 DBCORE_API long dbLSConvertJSON(const char *json, char *pdest,
diff --git a/modules/database/src/ioc/db/dbEvent.c b/modules/database/src/ioc/db/dbEvent.c
index b3c641798..85bba06cb 100644
--- a/modules/database/src/ioc/db/dbEvent.c
+++ b/modules/database/src/ioc/db/dbEvent.c
@@ -90,7 +90,7 @@ struct event_user {
     void                *extralabor_arg;/* parameter to above */
 
     epicsThreadId       taskid;         /* event handler task id */
-    struct evSubscrip   *pSuicideEvent; /* event that is deleteing itself */
+    struct evSubscrip   *pSuicideEvent; /* event that is deleting itself */
     unsigned            queovr;         /* event que overflow count */
     unsigned char       pendexit;       /* exit pend task */
     unsigned char       extra_labor;    /* if set call extra labor func */
@@ -102,7 +102,7 @@ struct event_user {
 
 /*
  * Reliable intertask communication requires copying the current value of the
- * channel for later queing so 3 stepper motor steps of 10 each do not turn
+ * channel for later queuing so 3 stepper motor steps of 10 each do not turn
  * into only 10 or 20 total steps part of the time.
  */
 
@@ -585,7 +585,7 @@ void db_cancel_event (dbEventSubscription event)
     /*
      * flag the event as canceled by NULLing out the callback handler
      *
-     * make certain that the event isnt being accessed while
+     * make certain that the event isn't being accessed while
      * its call back changes
      */
     LOCKEVQUE (pevent->ev_que);
@@ -811,7 +811,7 @@ static void db_queue_event_log (evSubscrip *pevent, db_field_log *pLog)
         pevent->nreplace++;
         /*
          * the event task has already been notified about
-         * this so we dont need to post the semaphore
+         * this so we don't need to post the semaphore
          */
         firstEventFlag = 0;
     }
@@ -844,7 +844,7 @@ static void db_queue_event_log (evSubscrip *pevent, db_field_log *pLog)
     UNLOCKEVQUE (ev_que);
 
     /*
-     * its more efficent to notify the event handler
+     * its more efficient to notify the event handler
      * only after the event is ready and the lock
      * is off in case it runs at a higher priority
      * than the caller here.
@@ -974,7 +974,7 @@ static int event_read ( struct event_que *ev_que )
          * Next event pointer can be used by event tasks to determine
          * if more events are waiting in the queue
          *
-         * Must remove the lock here so that we dont deadlock if
+         * Must remove the lock here so that we don't deadlock if
          * this calls dbGetField() and blocks on the record lock,
          * dbPutField() is in progress in another task, it has the
          * record lock, and it is calling db_post_events() waiting
diff --git a/modules/database/src/ioc/db/dbNotify.h b/modules/database/src/ioc/db/dbNotify.h
index 3262009c9..98408bf7e 100644
--- a/modules/database/src/ioc/db/dbNotify.h
+++ b/modules/database/src/ioc/db/dbNotify.h
@@ -130,7 +130,7 @@ DBCORE_API int dbNotifyDump(void);
  * if a process request is issued and also calls the client callbacks.
  *
  * A process request is issued if any of the following is true.
- * 1) The requester has issued a processs request and record is passive.
+ * 1) The requester has issued a process request and record is passive.
  * 2) The requester is doing a put, the record is passive, and either
  *     a) The field description is process passive.
  *     b) The field is PROC.
@@ -156,7 +156,7 @@ DBCORE_API int dbNotifyDump(void);
  *              As soon as a record completes processing the field is set NULL
  *      ppnr    pointer to processNotifyRecord, which is a private structure
  *              owned by dbNotify.
- *              dbNotify is reponsible for this structure.
+ *              dbNotify is responsible for this structure.
  *
  */
 #ifdef __cplusplus
diff --git a/modules/database/src/ioc/db/dbPutNotifyBlocker.cpp b/modules/database/src/ioc/db/dbPutNotifyBlocker.cpp
index 394b50c50..fe42d094c 100644
--- a/modules/database/src/ioc/db/dbPutNotifyBlocker.cpp
+++ b/modules/database/src/ioc/db/dbPutNotifyBlocker.cpp
@@ -110,7 +110,7 @@ extern "C" void putNotifyCompletion ( processNotify *ppn )
     if ( pNtfy ) {
         pBlocker->pNotify = 0;
         // Its necessary to signal the initiators now before we call
-        // the user callback. This is less efficent, and potentially
+        // the user callback. This is less efficient, and potentially
         // causes more thread context switching, but its probably
         // unavoidable because its possible that the use callback
         // might destroy this object.
diff --git a/modules/database/src/ioc/db/dbTest.c b/modules/database/src/ioc/db/dbTest.c
index 6f5c3eab2..029077c07 100644
--- a/modules/database/src/ioc/db/dbTest.c
+++ b/modules/database/src/ioc/db/dbTest.c
@@ -1300,7 +1300,7 @@ static void dbpr_insert_msg(TAB_BUFFER *pMsgBuff,size_t len,int tab_size)
     current_len = strlen(pMsgBuff->out_buff);
     tot_line = current_len + len;
 
-    /* flush buffer if overflow would occor */
+    /* flush buffer if overflow would occur */
     if (tot_line > MAXLINE)
         dbpr_msg_flush(pMsgBuff, tab_size);
 
diff --git a/modules/database/src/ioc/db/dbUnitTest.h b/modules/database/src/ioc/db/dbUnitTest.h
index 57ccd0259..60d4e7883 100644
--- a/modules/database/src/ioc/db/dbUnitTest.h
+++ b/modules/database/src/ioc/db/dbUnitTest.h
@@ -7,7 +7,7 @@
  \*************************************************************************/
 
 /** @file dbUnitTest.h
- * @brief Helpers for unitests of process database
+ * @brief Helpers for unittests of process database
  * @author Michael Davidsaver, Ralph Lange
  *
  * @see @ref dbunittest
@@ -149,7 +149,7 @@ DBCORE_API void testMonitorDestroy(testMonitor*);
  */
 DBCORE_API void testMonitorWait(testMonitor*);
 /** Return the number of monitor events which have occured since create,
- * or a pervious reset (called reset=1).
+ * or a previous reset (called reset=1).
  * Calling w/ reset=0 only returns the count.
  * Calling w/ reset=1 resets the count to zero and ensures that the next
  * wait will block unless subsequent events occur.  Returns the previous
diff --git a/modules/database/src/ioc/db/db_access_routines.h b/modules/database/src/ioc/db/db_access_routines.h
index cd8b09c40..ee2f07940 100644
--- a/modules/database/src/ioc/db/db_access_routines.h
+++ b/modules/database/src/ioc/db/db_access_routines.h
@@ -27,7 +27,7 @@ DBCORE_API extern volatile int interruptAccept;
 
 
 /*
- * Adaptors for db_access users
+ * Adapters for db_access users
  */
 DBCORE_API struct dbChannel * dbChannel_create(const char *pname);
 DBCORE_API int dbChannel_get(struct dbChannel *chan,
diff --git a/modules/database/src/ioc/dbStatic/dbStaticLib.c b/modules/database/src/ioc/dbStatic/dbStaticLib.c
index 35433d9cd..3ed08de72 100644
--- a/modules/database/src/ioc/dbStatic/dbStaticLib.c
+++ b/modules/database/src/ioc/dbStatic/dbStaticLib.c
@@ -677,7 +677,7 @@ long dbAddPath(DBBASE *pdbbase,const char *path)
     if (!path) return(0); /* Empty path strings are ignored */
     /* care is taken to properly deal with white space
      * 1) preceding and trailing white space is removed from paths
-     * 2) white space inbetween path separator counts as an empty name
+     * 2) white space in between path separator counts as an empty name
      *      (see below)
      */
     expectingPath = FALSE;
@@ -710,8 +710,8 @@ long dbAddPath(DBBASE *pdbbase,const char *path)
 
         /*
          * len is always nonzero because we found something that
-         * 1) isnt white space
-         * 2) isnt a path separator
+         * 1) isn't white space
+         * 2) isn't a path separator
          */
         len = (plast - path) + 1;
         if (dbAddOnePath (pdbbase, path, (unsigned) len)) return (-1);
@@ -722,7 +722,7 @@ long dbAddPath(DBBASE *pdbbase,const char *path)
     }
 
     /*
-     * an empty name at beginning, middle, or end of a path string that isnt
+     * an empty name at beginning, middle, or end of a path string that isn't
      * empty means current directory
      */
     if (expectingPath||sawMissingPath) {
@@ -2274,7 +2274,7 @@ long dbParseLink(const char *str, short ftype, dbLinkInfo *pinfo)
             len -= (parm - pstr);
         }
 
-        /* generalized extraction of ID charactor and integer pairs (eg. "#C15 S14") */
+        /* generalized extraction of ID character and integer pairs (eg. "#C15 S14") */
         ret = sscanf(pinfo->target, "# %c%d %c%d %c%d %c%d %c%d %c",
                      &pinfo->hwid[0], &pinfo->hwnums[0],
                      &pinfo->hwid[1], &pinfo->hwnums[1],
@@ -2333,11 +2333,11 @@ long dbParseLink(const char *str, short ftype, dbLinkInfo *pinfo)
     }
 
     pinfo->ltype = PV_LINK;
-    pstr = strchr(pstr, ' '); /* find start of link modifiers (can't be seperated by tabs) */
+    pstr = strchr(pstr, ' '); /* find start of link modifiers (can't be separated by tabs) */
     if (pstr) {
         *pstr++ = '\0'; /* isolate modifiers. pinfo->target is PV name only for re-use in struct pv_link */
 
-        /* Space seperation of modifiers isn't required, and other chars are ignored.
+        /* Space separation of modifiers isn't required, and other chars are ignored.
          * Order of comparisons resolves ambiguity by checking for
          * longer matches first.
          * eg. "QQCPPXMSITT" is pvlOptCPP|pvlOptMSI
diff --git a/modules/database/src/ioc/dbStatic/devSup.h b/modules/database/src/ioc/dbStatic/devSup.h
index c41b834ea..799569927 100644
--- a/modules/database/src/ioc/dbStatic/devSup.h
+++ b/modules/database/src/ioc/dbStatic/devSup.h
@@ -77,7 +77,7 @@ typedef struct typed_dset {
     long (*init_record)(struct dbCommon *prec);
     /** Called when SCAN="I/O Intr" on startup, or after SCAN is changed.
      *
-     * Caller must assign the third arguement (IOCSCANPVT*).  eg.
+     * Caller must assign the third argument (IOCSCANPVT*).  eg.
      @code
      struct mpvt {
         IOSCANPVT drvlist;
@@ -173,7 +173,7 @@ DBCORE_API void dbInitDevSup(struct devSup *pdevSup, dset *pdset);
 #define S_dev_badOutType    (M_devSup| 9) /*Bad OUT link type*/
 #define S_dev_badInitRet    (M_devSup|11) /*Bad init_rec return value */
 #define S_dev_badBus        (M_devSup|13) /*Illegal bus type*/
-#define S_dev_badCard       (M_devSup|15) /*Illegal or nonexistant module*/
+#define S_dev_badCard       (M_devSup|15) /*Illegal or nonexistent module*/
 #define S_dev_badSignal     (M_devSup|17) /*Illegal signal*/
 #define S_dev_NoInit        (M_devSup|19) /*No init*/
 #define S_dev_Conflict      (M_devSup|21) /*Multiple records accessing same signal*/
diff --git a/modules/database/src/ioc/dbStatic/link.h b/modules/database/src/ioc/dbStatic/link.h
index c5481fd74..74607a1b1 100644
--- a/modules/database/src/ioc/dbStatic/link.h
+++ b/modules/database/src/ioc/dbStatic/link.h
@@ -180,7 +180,7 @@ union value {
     struct vmeio        vmeio;          /* vme io point */
     struct camacio      camacio;        /* camac io point */
     struct rfio         rfio;           /* CEBAF RF buffer interface */
-    struct abio         abio;           /* allen-bradley io point */
+    struct abio         abio;           /* Allen-Bradley io point */
     struct gpibio       gpibio;
     struct bitbusio     bitbusio;
     struct instio       instio;         /* instrument io link */
diff --git a/modules/database/src/ioc/dbStatic/special.h b/modules/database/src/ioc/dbStatic/special.h
index 575294f3c..f340ca757 100644
--- a/modules/database/src/ioc/dbStatic/special.h
+++ b/modules/database/src/ioc/dbStatic/special.h
@@ -21,14 +21,14 @@
 extern "C" {
 #endif
 
-/*NOTE  Do NOT add aditional definitions with out modifying dbLexRoutines.c */
+/*NOTE  Do NOT add additional definitions with out modifying dbLexRoutines.c */
 /* types 1-99 are global. Record specific must start with 100 */
 #define SPC_NOMOD       1       /*Field must not be modified*/
 #define SPC_DBADDR      2       /*db_name_to_addr must call cvt_dbaddr*/
 #define SPC_SCAN        3       /*A scan related field is being changed*/
 #define SPC_ALARMACK    5       /*Special Alarm Acknowledgement*/
 #define SPC_AS          6       /* Access Security*/
-#define SPC_ATTRIBUTE   7       /* psuedo field, i.e. attribute field*/
+#define SPC_ATTRIBUTE   7       /* pseudo field, i.e. attribute field*/
 /* useful when record support must be notified of a field changing value*/
 #define SPC_MOD         100
 /* used by all records that support a reset field*/
diff --git a/modules/database/src/ioc/dbtemplate/msi.cpp b/modules/database/src/ioc/dbtemplate/msi.cpp
index 6445c22f1..d504e3ea4 100644
--- a/modules/database/src/ioc/dbtemplate/msi.cpp
+++ b/modules/database/src/ioc/dbtemplate/msi.cpp
@@ -317,7 +317,7 @@ static void makeSubstitutions(inputData * const inputPvt,
             pstart = ++p;
             /*Look for end quote*/
             while (*p && (*p != '"')) {
-                /*allow escape for embeded quote*/
+                /*allow escape for embedded quote*/
                 if ((p[0] == '\\') && p[1] == '"') {
                     p += 2;
                     continue;
@@ -1028,7 +1028,7 @@ static tokenType subGetNextToken(subFile *psubFile)
                 subFileErrPrint(psubFile, "Strings must be on single line\n");
                 abortExit(1);
             }
-            /*allow  escape for embeded quote*/
+            /*allow  escape for embedded quote*/
             if ((p[0] == '\\') && p[1] == '"') {
                 *pto++ = *p++;
                 *pto++ = *p++;
diff --git a/modules/database/src/ioc/rsrv/camessage.c b/modules/database/src/ioc/rsrv/camessage.c
index 21c835b8f..49b82ced7 100644
--- a/modules/database/src/ioc/rsrv/camessage.c
+++ b/modules/database/src/ioc/rsrv/camessage.c
@@ -97,7 +97,7 @@ typedef struct rsrv_put_notify {
 /*
  * casCalloc()
  *
- * (dont drop below some max block threshold)
+ * (don't drop below some max block threshold)
  */
 static void *casCalloc(size_t count, size_t size)
 {
@@ -341,7 +341,7 @@ static int bad_tcp_cmd_action ( caHdrLargeArray *mp, void *pPayload,
     log_header ( pCtx, client, mp, pPayload, 0 );
 
     /*
-     *  by default, clients dont recover
+     *  by default, clients don't recover
      *  from this
      */
     SEND_LOCK (client);
@@ -503,7 +503,7 @@ static void read_reply ( void *pArg, struct dbChannel *dbch,
     cid = ECA_NORMAL;
 
     /* If the client has requested a zero element count we interpret this as a
-     * request for all avaiable elements.  In this case we initialise the
+     * request for all available elements.  In this case we initialize the
      * header with the maximum element size specified by the database. */
     autosize = pevext->msg.m_count == 0;
     item_count =
@@ -870,7 +870,7 @@ static int host_name_action ( caHdrLargeArray *mp, void *pPayload,
     }
 
     /*
-     * user name will not change if there isnt enough memory
+     * user name will not change if there isn't enough memory
      */
     pMalloc = malloc(size);
     if(!pMalloc){
@@ -949,7 +949,7 @@ static int client_name_action ( caHdrLargeArray *mp, void *pPayload,
     }
 
     /*
-     * user name will not change if there isnt enough memory
+     * user name will not change if there isn't enough memory
      */
     pMalloc = malloc(size);
     if(!pMalloc){
@@ -1016,7 +1016,7 @@ unsigned    cid
      * NOTE: This detects the case where the PV id wraps
      * around and we attempt to have two resources on the same id.
      * The lock is applied here because on some architectures the
-     * ++ operator isnt atomic.
+     * ++ operator isn't atomic.
      */
     LOCK_CLIENTQ;
 
@@ -1436,7 +1436,7 @@ static void write_notify_reply ( struct client * pClient )
             msgtmp.m_available, 0 );
         if ( localStatus != ECA_NORMAL ) {
             /*
-             * inability to aquire buffer space
+             * inability to acquire buffer space
              * Indicates corruption
              */
             errlogPrintf("CA server corrupted - put call back(s) discarded\n");
@@ -1570,7 +1570,7 @@ static int rsrvExpandPutNotify (
 
     if ( sizeNeeded > pNotify->valueSize ) {
         /*
-         * try to use the union embeded in the free list
+         * try to use the union embedded in the free list
          * item, but allocate a random sized block if they
          * writing a vector.
          */
@@ -1625,7 +1625,7 @@ void rsrvFreePutNotify ( client *pClient,
         epicsMutexUnlock ( pClient->putNotifyLock );
 
         /*
-         * if any possiblity that the put notify is
+         * if any possibility that the put notify is
          * outstanding then cancel it
          */
         if ( busyTmp ) {
@@ -1736,7 +1736,7 @@ static int write_notify_action ( caHdrLargeArray *mp, void *pPayload,
         if ( ! pciu->pPutNotify ) {
             /*
              * send error and go to next request
-             * if there isnt enough memory left
+             * if there isn't enough memory left
              */
             log_header ( "no memory to initiate put notify",
                 client, mp, pPayload, 0 );
@@ -2144,7 +2144,7 @@ int rsrv_version_reply ( struct client *client )
     SEND_LOCK ( client );
     /*
      * sequence number is specified zero when we copy in the
-     * header because we dont know it until we receive a datagram
+     * header because we don't know it until we receive a datagram
      * from the client
      */
     status = cas_copy_in_header ( client, CA_PROTO_VERSION,
@@ -2210,7 +2210,7 @@ static int search_reply_udp ( caHdrLargeArray *mp, void *pPayload, struct client
      * starting with V4.4 the count field is used (abused)
      * to store the minor version number of the client.
      *
-     * New versions dont alloc the channel in response
+     * New versions don't alloc the channel in response
      * to a search request.
      * For these, allocation has been moved to claim_ciu_action().
      *
@@ -2285,7 +2285,7 @@ static int search_reply_tcp (
     }
 
     /*
-     * stop further use of server if memory becomes scarse
+     * stop further use of server if memory becomes scarce
      */
     spaceAvailOnFreeList =     freeListItemsAvail ( rsrvChanFreeList ) > 0
                             && freeListItemsAvail ( rsrvEventFreeList ) > reasonableMonitorSpace;
@@ -2397,7 +2397,7 @@ int camessage ( struct client *client )
 
     assert(pCaBucket);
 
-    /* drain remnents of large messages that will not fit */
+    /* drain remnants of large messages that will not fit */
     if ( client->recvBytesToDrain ) {
         if ( client->recvBytesToDrain >= client->recv.cnt ) {
             client->recvBytesToDrain -= client->recv.cnt;
@@ -2472,7 +2472,7 @@ int camessage ( struct client *client )
         }
 
         /*
-         * disconnect clients that dont send 8 byte
+         * disconnect clients that don't send 8 byte
          * aligned payloads
          */
         if ( msgsize & 0x7 ) {
diff --git a/modules/database/src/ioc/rsrv/camsgtask.c b/modules/database/src/ioc/rsrv/camsgtask.c
index bcd30d1bd..eee7ab238 100644
--- a/modules/database/src/ioc/rsrv/camsgtask.c
+++ b/modules/database/src/ioc/rsrv/camsgtask.c
@@ -50,7 +50,7 @@ void camsgtask ( void *pParm )
         int status;
 
         /*
-         * allow message to batch up if more are comming
+         * allow message to batch up if more are coming
          */
         status = socket_ioctl (client->sock, FIONREAD, &check_nchars);
         if (status < 0) {
diff --git a/modules/database/src/ioc/rsrv/caservertask.c b/modules/database/src/ioc/rsrv/caservertask.c
index 4b37ab7e9..4cff62224 100644
--- a/modules/database/src/ioc/rsrv/caservertask.c
+++ b/modules/database/src/ioc/rsrv/caservertask.c
@@ -545,7 +545,7 @@ void rsrv_init (void)
     beacon_startStopEvent = epicsEventMustCreate(epicsEventEmpty);
     castcp_ctl = ctlPause;
 
-    /* Thread priorites
+    /* Thread priorities
      * Now starting per interface
      *  TCP Listener: epicsThreadPriorityCAServerLow-2
      *  Name receiver: epicsThreadPriorityCAServerLow-4
@@ -1204,7 +1204,7 @@ void destroy_tcp_client ( struct client *client )
         assert ( ! status );
 
         /*
-         * wait for extra labor in progress to comple
+         * wait for extra labor in progress to complete
          */
         db_flush_extra_labor_event ( client->evuser );
     }
@@ -1229,7 +1229,7 @@ struct client * create_client ( SOCKET sock, int proto )
     size_t        spaceNeeded;
 
     /*
-     * stop further use of server if memory becomes scarse
+     * stop further use of server if memory becomes scarce
      */
     spaceAvailOnFreeList =     freeListItemsAvail ( rsrvClientFreeList ) > 0
                             && freeListItemsAvail ( rsrvSmallBufFreeListTCP ) > 0;
diff --git a/modules/database/src/ioc/rsrv/cast_server.c b/modules/database/src/ioc/rsrv/cast_server.c
index 0668c63a9..a18c41015 100644
--- a/modules/database/src/ioc/rsrv/cast_server.c
+++ b/modules/database/src/ioc/rsrv/cast_server.c
@@ -16,7 +16,7 @@
  *  Improvements
  *  ------------
  *  .01
- *  Dont send channel found message unless there is memory, a task slot,
+ *  Don't send channel found message unless there is memory, a task slot,
  *  and a TCP socket available. Send a diagnostic instead.
  *  Or ... make the timeout shorter? This is only a problem if
  *  they persist in trying to make a connection after getting no
@@ -269,9 +269,9 @@ void cast_server(void *pParm)
         }
 
         /*
-         * allow messages to batch up if more are comming
+         * allow messages to batch up if more are coming
          */
-        nchars = 0; /* supress purify warning */
+        nchars = 0; /* suppress purify warning */
         status = socket_ioctl(recv_sock, FIONREAD, &nchars);
         if (status<0) {
             errlogPrintf ("CA cast server: Unable to fetch N characters pending\n");
diff --git a/modules/database/src/ioc/rsrv/server.h b/modules/database/src/ioc/rsrv/server.h
index c0593739e..604880c12 100644
--- a/modules/database/src/ioc/rsrv/server.h
+++ b/modules/database/src/ioc/rsrv/server.h
@@ -239,7 +239,7 @@ void initializePutNotifyFreeList (void);
 unsigned rsrvSizeOfPutNotify ( struct rsrv_put_notify *pNotify );
 
 /*
- * inclming protocol maintetnance
+ * incoming protocol maintenance
  */
 void casExpandRecvBuffer ( struct client *pClient, ca_uint32_t size );
 
diff --git a/modules/database/src/std/dev/devBoSoft.c b/modules/database/src/std/dev/devBoSoft.c
index 59c402367..c20e5d2cd 100644
--- a/modules/database/src/std/dev/devBoSoft.c
+++ b/modules/database/src/std/dev/devBoSoft.c
@@ -43,7 +43,7 @@ static long init_record(dbCommon *pcommon)
 {
    long status=0;
 
-    /* dont convert */
+    /* don't convert */
    status=2;
    return status;
 
diff --git a/modules/database/src/std/rec/aaoRecord.c b/modules/database/src/std/rec/aaoRecord.c
index e96f2b7d0..c9939b343 100644
--- a/modules/database/src/std/rec/aaoRecord.c
+++ b/modules/database/src/std/rec/aaoRecord.c
@@ -162,7 +162,7 @@ static long process(struct dbCommon *pcommon)
         prec->udf = FALSE;
 
         /* Update the timestamp before writing output values so it
-         * will be uptodate if any downstream records fetch it via TSEL */
+         * will be up to date if any downstream records fetch it via TSEL */
         recGblGetTimeStampSimm(prec, prec->simm, NULL);
     }
 
@@ -357,7 +357,7 @@ static long writeValue(aaoRecord *prec)
     case menuYesNoYES: {
         recGblSetSevr(prec, SIMM_ALARM, prec->sims);
         if (prec->pact || (prec->sdly < 0.)) {
-            /* Device suport is responsible for buffer
+            /* Device support is responsible for buffer
                which might be write-only so we may not be
                allowed to call dbPutLink on it.
                Maybe also device support has an advanced
diff --git a/modules/database/src/std/rec/aiRecord.c b/modules/database/src/std/rec/aiRecord.c
index 8d31b07ff..72a4c61f5 100644
--- a/modules/database/src/std/rec/aiRecord.c
+++ b/modules/database/src/std/rec/aiRecord.c
@@ -43,7 +43,7 @@
 #undef  GEN_SIZE_OFFSET
 #include "epicsExport.h"
 
-/* Hysterisis for alarm filtering: 1-1/e */
+/* Hysteresis for alarm filtering: 1-1/e */
 #define THRESHOLD 0.6321
 
 /* Create RSET - Record Support Entry Table*/
diff --git a/modules/database/src/std/rec/aoRecord.c b/modules/database/src/std/rec/aoRecord.c
index 022424054..a7a31ab7a 100644
--- a/modules/database/src/std/rec/aoRecord.c
+++ b/modules/database/src/std/rec/aoRecord.c
@@ -188,7 +188,7 @@ static long process(struct dbCommon *pcommon)
         if(!status) convert(prec, value);
         prec->udf = isnan(prec->val);
         /* Update the timestamp before writing output values so it
-         * will be uptodate if any downstream records fetch it via TSEL */
+         * will be up to date if any downstream records fetch it via TSEL */
         recGblGetTimeStampSimm(prec, prec->simm, NULL);
     }
 
diff --git a/modules/database/src/std/rec/boRecord.c b/modules/database/src/std/rec/boRecord.c
index 05195b880..ca254adde 100644
--- a/modules/database/src/std/rec/boRecord.c
+++ b/modules/database/src/std/rec/boRecord.c
@@ -211,7 +211,7 @@ static long process(struct dbCommon *pcommon)
         } else prec->rval = (epicsUInt32)prec->val;
 
         /* Update the timestamp before writing output values so it
-         * will be uptodate if any downstream records fetch it via TSEL */
+         * will be up to date if any downstream records fetch it via TSEL */
         recGblGetTimeStampSimm(prec, prec->simm, NULL);
     }
 
diff --git a/modules/database/src/std/rec/calcRecord.c b/modules/database/src/std/rec/calcRecord.c
index 8bb9435fa..4467c7080 100644
--- a/modules/database/src/std/rec/calcRecord.c
+++ b/modules/database/src/std/rec/calcRecord.c
@@ -37,7 +37,7 @@
 #undef  GEN_SIZE_OFFSET
 #include "epicsExport.h"
 
-/* Hysterisis for alarm filtering: 1-1/e */
+/* Hysteresis for alarm filtering: 1-1/e */
 #define THRESHOLD 0.6321
 
 /* Create RSET - Record Support Entry Table */
diff --git a/modules/database/src/std/rec/calcoutRecord.c b/modules/database/src/std/rec/calcoutRecord.c
index eadcc5862..319994596 100644
--- a/modules/database/src/std/rec/calcoutRecord.c
+++ b/modules/database/src/std/rec/calcoutRecord.c
@@ -245,7 +245,7 @@ static long process(struct dbCommon *pcommon)
 
         if ( !pact ) {
             /* Update the timestamp before writing output values so it
-             * will be uptodate if any downstream records fetch it via TSEL */
+             * will be up to date if any downstream records fetch it via TSEL */
             recGblGetTimeStamp(prec);
         }
         /* check for output link execution */
diff --git a/modules/database/src/std/rec/histogramRecord.c b/modules/database/src/std/rec/histogramRecord.c
index 44b278f39..9f35870ed 100644
--- a/modules/database/src/std/rec/histogramRecord.c
+++ b/modules/database/src/std/rec/histogramRecord.c
@@ -160,7 +160,7 @@ static long init_record(struct dbCommon *pcommon, int pass)
             prec->bptr = calloc(prec->nelm, sizeof(epicsUInt32));
         }
 
-        /* calulate width of array element */
+        /* calculate width of array element */
         prec->wdth = (prec->ulim - prec->llim) / prec->nelm;
         return 0;
     }
diff --git a/modules/database/src/std/rec/int64inRecord.c b/modules/database/src/std/rec/int64inRecord.c
index 2cd804d07..d4ea757c3 100644
--- a/modules/database/src/std/rec/int64inRecord.c
+++ b/modules/database/src/std/rec/int64inRecord.c
@@ -40,7 +40,7 @@
 #undef  GEN_SIZE_OFFSET
 #include "epicsExport.h"
 
-/* Hysterisis for alarm filtering: 1-1/e */
+/* Hysteresis for alarm filtering: 1-1/e */
 #define THRESHOLD 0.6321
 /* Create RSET - Record Support Entry Table*/
 #define report NULL
diff --git a/modules/database/src/std/rec/int64outRecord.c b/modules/database/src/std/rec/int64outRecord.c
index bf306e8e0..d5747f0c2 100644
--- a/modules/database/src/std/rec/int64outRecord.c
+++ b/modules/database/src/std/rec/int64outRecord.c
@@ -146,7 +146,7 @@ static long process(dbCommon *pcommon)
         if (!status) convert(prec,value);
 
         /* Update the timestamp before writing output values so it
-         * will be uptodate if any downstream records fetch it via TSEL */
+         * will be up to date if any downstream records fetch it via TSEL */
         recGblGetTimeStampSimm(prec, prec->simm, NULL);
     }
 
diff --git a/modules/database/src/std/rec/longinRecord.c b/modules/database/src/std/rec/longinRecord.c
index a6b58eef4..2bd8a8350 100644
--- a/modules/database/src/std/rec/longinRecord.c
+++ b/modules/database/src/std/rec/longinRecord.c
@@ -41,7 +41,7 @@
 #undef  GEN_SIZE_OFFSET
 #include "epicsExport.h"
 
-/* Hysterisis for alarm filtering: 1-1/e */
+/* Hysteresis for alarm filtering: 1-1/e */
 #define THRESHOLD 0.6321
 /* Create RSET - Record Support Entry Table*/
 #define report NULL
diff --git a/modules/database/src/std/rec/longoutRecord.c b/modules/database/src/std/rec/longoutRecord.c
index f0e2252bd..faab03083 100644
--- a/modules/database/src/std/rec/longoutRecord.c
+++ b/modules/database/src/std/rec/longoutRecord.c
@@ -148,7 +148,7 @@ static long process(struct dbCommon *pcommon)
         if (!status) convert(prec,value);
 
         /* Update the timestamp before writing output values so it
-         * will be uptodate if any downstream records fetch it via TSEL */
+         * will be up to date if any downstream records fetch it via TSEL */
         recGblGetTimeStampSimm(prec, prec->simm, NULL);
     }
 
diff --git a/modules/database/src/std/rec/mbbiRecord.c b/modules/database/src/std/rec/mbbiRecord.c
index c8853f0ec..8bb14c647 100644
--- a/modules/database/src/std/rec/mbbiRecord.c
+++ b/modules/database/src/std/rec/mbbiRecord.c
@@ -40,7 +40,7 @@
 #undef  GEN_SIZE_OFFSET
 #include "epicsExport.h"
 
-/* Hysterisis for alarm filtering: 1-1/e */
+/* Hysteresis for alarm filtering: 1-1/e */
 #define THRESHOLD 0.6321
 
 /* Create RSET - Record Support Entry Table*/
@@ -177,7 +177,7 @@ static long process(struct dbCommon *pcommon)
 
         if (prec->sdef) {
             pstate_values = &(prec->zrvl);
-            prec->val = 65535;         /* Initalize to unknown state*/
+            prec->val = 65535;         /* Initialize to unknown state*/
             for (i = 0; i < 16; i++) {
                 if (*pstate_values == rval) {
                     prec->val = i;
diff --git a/modules/database/src/std/rec/mbboDirectRecord.c b/modules/database/src/std/rec/mbboDirectRecord.c
index b2b531572..7c5ba294c 100644
--- a/modules/database/src/std/rec/mbboDirectRecord.c
+++ b/modules/database/src/std/rec/mbboDirectRecord.c
@@ -196,7 +196,7 @@ static long process(struct dbCommon *pcommon)
         convert(prec);
 
         /* Update the timestamp before writing output values so it
-         * will be uptodate if any downstream records fetch it via TSEL */
+         * will be up to date if any downstream records fetch it via TSEL */
         recGblGetTimeStampSimm(prec, prec->simm, NULL);
     }
 
diff --git a/modules/database/src/std/rec/mbboRecord.c b/modules/database/src/std/rec/mbboRecord.c
index 83448f19a..5acde7515 100644
--- a/modules/database/src/std/rec/mbboRecord.c
+++ b/modules/database/src/std/rec/mbboRecord.c
@@ -151,7 +151,7 @@ static long init_record(struct dbCommon *pcommon, int pass)
                 epicsUInt32 *pstate_values = &prec->zrvl;
                 int i;
 
-                prec->val = 65535;        /* initalize to unknown state */
+                prec->val = 65535;        /* initialize to unknown state */
                 for (i = 0; i < 16; i++) {
                     if (*pstate_values == rval) {
                         prec->val = i;
@@ -217,7 +217,7 @@ static long process(struct dbCommon *pcommon)
         convert(prec);
 
         /* Update the timestamp before writing output values so it
-         * will be uptodate if any downstream records fetch it via TSEL */
+         * will be up to date if any downstream records fetch it via TSEL */
         recGblGetTimeStampSimm(prec, prec->simm, NULL);
     }
 
diff --git a/modules/database/src/std/rec/stringoutRecord.c b/modules/database/src/std/rec/stringoutRecord.c
index e84484485..6f468c9a4 100644
--- a/modules/database/src/std/rec/stringoutRecord.c
+++ b/modules/database/src/std/rec/stringoutRecord.c
@@ -148,7 +148,7 @@ static long process(struct dbCommon *pcommon)
     }
 
     /* Update the timestamp before writing output values so it
-     * will be uptodate if any downstream records fetch it via TSEL */
+     * will be up to date if any downstream records fetch it via TSEL */
     recGblGetTimeStampSimm(prec, prec->simm, NULL);
 
     if (prec->nsev < INVALID_ALARM )
diff --git a/modules/database/test/ioc/db/dbCACTest.cpp b/modules/database/test/ioc/db/dbCACTest.cpp
index 0420fb228..e008fb0db 100644
--- a/modules/database/test/ioc/db/dbCACTest.cpp
+++ b/modules/database/test/ioc/db/dbCACTest.cpp
@@ -6,7 +6,7 @@
 * in file LICENSE that is included with this distribution.
  \*************************************************************************/
 /*
- * Part of dbCaLinkTest, compiled seperately to avoid
+ * Part of dbCaLinkTest, compiled separately to avoid
  * dbAccess.h vs. db_access.h conflicts
  */
 
diff --git a/modules/database/test/ioc/db/dbStressLock.c b/modules/database/test/ioc/db/dbStressLock.c
index 529050f6c..6cac59fe2 100644
--- a/modules/database/test/ioc/db/dbStressLock.c
+++ b/modules/database/test/ioc/db/dbStressLock.c
@@ -9,7 +9,7 @@
 /*
  * Lockset stress test.
  *
- * The test stratagy is for N threads to contend for M records.
+ * The test strategy is for N threads to contend for M records.
  * Each thread will perform one of three operations:
  * 1) Lock a single record.
  * 2) Lock several records.
diff --git a/modules/database/test/ioc/db/jlinkz.c b/modules/database/test/ioc/db/jlinkz.c
index 1b4dc2c2e..087cc0520 100644
--- a/modules/database/test/ioc/db/jlinkz.c
+++ b/modules/database/test/ioc/db/jlinkz.c
@@ -95,7 +95,7 @@ long z_getval(struct link *plink, short dbrType, void *pbuffer,
     return ret;
 }
 
-/* TODO: atomicly get value and alarm */
+/* TODO: atomically get value and alarm */
 static
 long z_getalarm(const struct link *plink, epicsEnum16 *status,
         epicsEnum16 *severity)
diff --git a/modules/database/test/std/rec/dbHeaderTest.c b/modules/database/test/std/rec/dbHeaderTest.c
index 20472c24d..7a45ee415 100644
--- a/modules/database/test/std/rec/dbHeaderTest.c
+++ b/modules/database/test/std/rec/dbHeaderTest.c
@@ -6,7 +6,7 @@
 \*************************************************************************/
 
 /* This test includes all public headers from libCom and database modules
- * to ensure they are all syntaxtically correct in both C and C++
+ * to ensure they are all syntactically correct in both C and C++
  */
 
 #include <aaiRecord.h>
diff --git a/modules/libcom/RTEMS/posix/rtems_init.c b/modules/libcom/RTEMS/posix/rtems_init.c
index 09c7d60a5..ae3e8b5b9 100644
--- a/modules/libcom/RTEMS/posix/rtems_init.c
+++ b/modules/libcom/RTEMS/posix/rtems_init.c
@@ -362,7 +362,7 @@ initialize_remote_filesystem(char **argv, int hasLocalFilesystem)
             argv[1] = rtems_bsdnet_bootp_cmdline;
             /*
              * Its probably common to embed the mount point in the server
-             * name so, when this is occurring, dont clobber the mount point
+             * name so, when this is occurring, don't clobber the mount point
              * by appending the first node from the command path. This allows
              * the mount point to be a different path then the server's mount
              * path.
@@ -883,7 +883,7 @@ telnet_pseudoIocsh(char *name, __attribute__((unused))void *arg)
 
 /*
  *  Telnet daemon configuration
- * 0 or NULL for most fields in thsi struct indicate default values to RTEMS.
+ * 0 or NULL for most fields in this struct indicate default values to RTEMS.
  */
 rtems_telnetd_config_table rtems_telnetd_config = {
   .command = SHELL_ENTRY,
@@ -990,7 +990,7 @@ POSIX_Init ( void *argument __attribute__((unused)))
     /* Let other tasks run to complete background work */
     default_network_set_self_prio(RTEMS_MAXIMUM_PRIORITY - 1U);
 
-    /* supress all output from bsd network initialization */ 
+    /* suppress all output from bsd network initialization */ 
     rtems_bsd_set_vprintf_handler(rtems_bsd_vprintf_handler_mute);
 
     sc = rtems_bsd_initialize();
diff --git a/modules/libcom/RTEMS/rtems_netconfig.c b/modules/libcom/RTEMS/rtems_netconfig.c
index 0207512c7..38fb6bfce 100644
--- a/modules/libcom/RTEMS/rtems_netconfig.c
+++ b/modules/libcom/RTEMS/rtems_netconfig.c
@@ -10,7 +10,7 @@
  *              eric.norum@usask.ca
  *              (306) 966-5394
  *
- * This file can be copied to an application source dirctory
+ * This file can be copied to an application source directory
  * and modified to override the values shown below.
  */
 #include <stdio.h>
diff --git a/modules/libcom/RTEMS/rtems_util.c b/modules/libcom/RTEMS/rtems_util.c
index 84571e7fd..acbb5f17c 100644
--- a/modules/libcom/RTEMS/rtems_util.c
+++ b/modules/libcom/RTEMS/rtems_util.c
@@ -5,7 +5,7 @@
 * in file LICENSE that is included with this distribution.
 \*************************************************************************/
 /*
- * RTEMS utilitiy routines for EPICS
+ * RTEMS utility routines for EPICS
  *      Author: W. Eric Norum
  *              eric@cls.usask.ca
  *              (306) 966-6055
diff --git a/modules/libcom/RTEMS/score/rtems_init.c b/modules/libcom/RTEMS/score/rtems_init.c
index 986e09623..f8cd62d5d 100644
--- a/modules/libcom/RTEMS/score/rtems_init.c
+++ b/modules/libcom/RTEMS/score/rtems_init.c
@@ -297,7 +297,7 @@ initialize_remote_filesystem(char **argv, int hasLocalFilesystem)
             argv[1] = rtems_bsdnet_bootp_cmdline;
             /*
              * Its probably common to embed the mount point in the server
-             * name so, when this is occurring, dont clobber the mount point
+             * name so, when this is occurring, don't clobber the mount point
              * by appending the first node from the command path. This allows
              * the mount point to be a different path then the server's mount
              * path.
diff --git a/modules/libcom/RTEMS/setBootConfigFromNVRAM.c b/modules/libcom/RTEMS/setBootConfigFromNVRAM.c
index deb9f0654..9f1b3e4e7 100644
--- a/modules/libcom/RTEMS/setBootConfigFromNVRAM.c
+++ b/modules/libcom/RTEMS/setBootConfigFromNVRAM.c
@@ -267,7 +267,7 @@ setBootConfigFromNVRAM(void)
         return;
 
     /*
-     * Get network configuation from PPCBUG.
+     * Get network configuration from PPCBUG.
      * The 'correct' way to do this would be to issue a .NETCFIG PPCBUG
      * system call.  Unfortunately it is very difficult to issue such a
      * call once RTEMS is up and running so we just copy from the 'known'
diff --git a/modules/libcom/src/as/asLibRoutines.c b/modules/libcom/src/as/asLibRoutines.c
index d5767fd28..fce4a41c2 100644
--- a/modules/libcom/src/as/asLibRoutines.c
+++ b/modules/libcom/src/as/asLibRoutines.c
@@ -497,7 +497,7 @@ long epicsStdCall asCompute(ASCLIENTPVT asClientPvt)
     return(status);
 }
 
-/*The dump routines do not lock. Thus they may get inconsistant data.*/
+/*The dump routines do not lock. Thus they may get inconsistent data.*/
 /*HOWEVER if they did lock and a user interrupts one of then then BAD BAD*/
 static const char *asAccessName[] = {"NONE","READ","WRITE"};
 static const char *asTrapOption[] = {"NOTRAPWRITE","TRAPWRITE"};
diff --git a/modules/libcom/src/as/asTrapWrite.h b/modules/libcom/src/as/asTrapWrite.h
index 008fbc140..0d9f4d99b 100644
--- a/modules/libcom/src/as/asTrapWrite.h
+++ b/modules/libcom/src/as/asTrapWrite.h
@@ -30,8 +30,8 @@ extern "C" {
  * \brief The message passed to registered listeners.
  */
 typedef struct asTrapWriteMessage {
-    const char *userid; /**< \brief Userid of whoever orginated the request. */
-    const char *hostid; /**< \brief Hostid of whoever orginated the request. */
+    const char *userid; /**< \brief Userid of whoever originated the request. */
+    const char *hostid; /**< \brief Hostid of whoever originated the request. */
     /** \brief A field for use by the server.
      *
      * Any listener that uses this field must know what type of
diff --git a/modules/libcom/src/bucketLib/bucketLib.c b/modules/libcom/src/bucketLib/bucketLib.c
index 95890a2cf..5fcc3c36c 100644
--- a/modules/libcom/src/bucketLib/bucketLib.c
+++ b/modules/libcom/src/bucketLib/bucketLib.c
@@ -347,7 +347,7 @@ static int bucketAddItem(BUCKET *prb, bucketSET *pBSET, const void *pId, const v
     assert ((hashid & ~prb->hashIdMask) == 0);
     ppi = &prb->pTable[hashid];
     /*
-     * Dont reuse a resource id !
+     * Don't reuse a resource id !
      */
     ppiExists = (*pBSET->pCompare) (ppi, pId);
     if (ppiExists) {
diff --git a/modules/libcom/src/calc/calcPerform.c b/modules/libcom/src/calc/calcPerform.c
index 1510308bb..39b1c3f9d 100644
--- a/modules/libcom/src/calc/calcPerform.c
+++ b/modules/libcom/src/calc/calcPerform.c
@@ -288,7 +288,7 @@ LIBCOM_API long
             break;
 
         /* Be VERY careful converting double to int in case bit 31 is set!
-         * Out-of-range errors give very different results on different sytems.
+         * Out-of-range errors give very different results on different systems.
          * Convert negative doubles to signed and positive doubles to unsigned
          * first to avoid overflows if bit 32 is set.
          * The result is always signed, values with bit 31 set are negative
diff --git a/modules/libcom/src/calc/postfix.h b/modules/libcom/src/calc/postfix.h
index eb47613b6..d4c4dea9b 100644
--- a/modules/libcom/src/calc/postfix.h
+++ b/modules/libcom/src/calc/postfix.h
@@ -122,7 +122,7 @@ extern "C" {
  * \param perror Place to return an error code
  * \return Non-zero value in event of error
  *
- * It is the callers's responsibility to ensure that \c ppostfix points
+ * It is the caller's responsibility to ensure that \c ppostfix points
  * to sufficient storage to hold the postfix expression. The macro
  * INFIX_TO_POSTFIX_SIZE(n) can be used to calculate an appropriate
  * postfix buffer size from the length of the infix buffer.
@@ -212,7 +212,7 @@ extern "C" {
  *
  * -# ***Algebraic Functions***
  *  Various algebraic functions are available which take parameters inside
- *  parentheses. The parameter seperator is a comma.
+ *  parentheses. The parameter separator is a comma.
  *
  *    - Absolute value: abs(a)
  *    - Exponential ea: exp(a)
@@ -291,7 +291,7 @@ extern "C" {
  *        - a < 360 ? a+1 : 0
  *
  * -# ***Parentheses***
- * Sub-expressions can be placed within parentheses to override operator precence rules.
+ * Sub-expressions can be placed within parentheses to override operator presence rules.
  * Parentheses can be nested to any depth, but the intermediate value stack used by
  * the expression evaluation engine is limited to 80 results (which require an
  * expression at least 321 characters long to reach).
@@ -323,7 +323,7 @@ LIBCOM_API long
  * bitmaps which return that information to the caller. Passing a NULL value
  * for either of these pointers is legal if only the other is needed.
  *
- * The least signficant bit (bit 0) of the bitmap at \c *pinputs will be set
+ * The least significant bit (bit 0) of the bitmap at \c *pinputs will be set
  * if the expression depends on the argument A, and so on through bit 11 for
  * the argument L. An argument that is not used until after a value has been
  * assigned to it will not be set in the pinputs bitmap, thus the bits can
diff --git a/modules/libcom/src/cvtFast/cvtFast.c b/modules/libcom/src/cvtFast/cvtFast.c
index 9cfbd4271..28abfe2c1 100644
--- a/modules/libcom/src/cvtFast/cvtFast.c
+++ b/modules/libcom/src/cvtFast/cvtFast.c
@@ -93,7 +93,7 @@ int cvtFloatToString(float flt_value, char *pdest,
 
     /* fraction */
     if (precision > 0){
-    /* convert fractional portional to ASCII */
+    /* convert fractional portion to ASCII */
         *pdest = '.';
         pdest++;
         for (fplace /= 10, i = precision; i > 0; fplace /= 10,i--){
@@ -174,7 +174,7 @@ int cvtDoubleToString(
 
     /* fraction */
     if (precision > 0){
-    /* convert fractional portional to ASCII */
+    /* convert fractional portion to ASCII */
         *pdest = '.';
         pdest++;
         for (fplace /= 10, i = precision; i > 0; fplace /= 10,i--){
diff --git a/modules/libcom/src/cxxTemplates/epicsSingleton.h b/modules/libcom/src/cxxTemplates/epicsSingleton.h
index 817b7966c..f898f6519 100644
--- a/modules/libcom/src/cxxTemplates/epicsSingleton.h
+++ b/modules/libcom/src/cxxTemplates/epicsSingleton.h
@@ -63,7 +63,7 @@ public:
     };
     friend class reference;
     epicsSingleton () {}
-    // mutex lock/unlock pair overhead incured
+    // mutex lock/unlock pair overhead incurred
     // when either of these are called
     reference getReference ();
     const reference getReference () const;
@@ -168,12 +168,12 @@ inline void * SingletonUntyped :: pInstance () const
 
 inline SingletonUntyped :: ~SingletonUntyped ()
 {
-    // we dont assert fail on non-zero _refCount
+    // we don't assert fail on non-zero _refCount
     // and or non nill _pInstance here because this
-    // is designed to tolarate situations where
+    // is designed to tolerate situations where
     // file scope epicsSingleton objects (which
-    // theoretically dont have storage lifespan
-    // issues) are deleted in a non-determanistic
+    // theoretically don't have storage lifespan
+    // issues) are deleted in a non-deterministic
     // order
 #   if 0
         assert ( _refCount == 0 );
diff --git a/modules/libcom/src/cxxTemplates/resourceLib.h b/modules/libcom/src/cxxTemplates/resourceLib.h
index 0f3e762c0..28aca6f59 100644
--- a/modules/libcom/src/cxxTemplates/resourceLib.h
+++ b/modules/libcom/src/cxxTemplates/resourceLib.h
@@ -13,7 +13,7 @@
  *      indexing is implemented with a hash lookup. The identifier type
  *      implements the hash algorithm (or derives from one of the supplied
  *      identifier types which provide a hashing routine). The table expands
- *      dynamically depending on load, and without introducing non-determanistic
+ *      dynamically depending on load, and without introducing non-deterministic
  *      latency.
  *
  *      Unsigned integer and string identifier classes are supplied here.
@@ -86,13 +86,13 @@ public:
     void removeAll ( tsSLList<T> & destination ); // remove all entries
     T * lookup ( const ID &idIn ) const; // locate entry
     // Call (pT->*pCB) () for each entry but expect poor performance
-    // with sparcely populated tables
+    // with sparsely populated tables
     void traverse ( void (T::*pCB)() );
     void traverseConst ( void (T::*pCB)() const ) const;
     unsigned numEntriesInstalled () const;
     void setTableSize ( const unsigned newTableSize );
     // iterate through all entries but expect poor performance
-    // with sparcely populated tables
+    // with sparsely populated tables
     typedef resTableIter < T, ID > iterator;
     typedef resTableIterConst < T, ID > iteratorConst;
     iterator firstIter ();
@@ -523,7 +523,7 @@ inline unsigned resTable<T,ID>::tableSize () const
     }
 }
 
-// it will be more efficent to call this once prior to installing
+// it will be more efficient to call this once prior to installing
 // the first entry
 template <class T, class ID>
 void resTable<T,ID>::setTableSize ( const unsigned newTableSize )
@@ -550,12 +550,12 @@ void resTable<T,ID>::setTableSize ( const unsigned newTableSize )
 template <class T, class ID>
 bool resTable<T,ID>::setTableSizePrivate ( unsigned logBaseTwoTableSizeIn )
 {
-    // dont shrink
+    // don't shrink
     if ( this->logBaseTwoTableSize >= logBaseTwoTableSizeIn ) {
         return true;
     }
 
-    // dont allow ridiculously small tables
+    // don't allow ridiculously small tables
     if ( logBaseTwoTableSizeIn < 4 ) {
         logBaseTwoTableSizeIn = 4;
     }
@@ -1036,14 +1036,14 @@ inline resTableIndex integerHash ( unsigned MIN_INDEX_WIDTH,
     resTableIndex hashid = static_cast <resTableIndex> ( id );
 
     //
-    // the intent here is to gurantee that all components of the
+    // the intent here is to guarantee that all components of the
     // integer contribute even if the resTableIndex returned might
     // index a small table.
     //
     // On most compilers the optimizer will unroll this loop so this
     // is actually a very small inline function
     //
-    // Experiments using the microsoft compiler show that this isnt
+    // Experiments using the microsoft compiler show that this isn't
     // slower than switching on the architecture size and unrolling the
     // loop explicitly (that solution has resulted in portability
     // problems in the past).
@@ -1142,7 +1142,7 @@ stringId::~stringId()
             // each cast away of const, but in this case
             // it cant be avoided.
             //
-            // The DEC compiler complains that const isnt
+            // The DEC compiler complains that const isn't
             // really significant in a cast if it is present.
             //
             // I hope that deleting a pointer to "char"
diff --git a/modules/libcom/src/cxxTemplates/tsDLList.h b/modules/libcom/src/cxxTemplates/tsDLList.h
index 38073ff63..87b9f7cf3 100644
--- a/modules/libcom/src/cxxTemplates/tsDLList.h
+++ b/modules/libcom/src/cxxTemplates/tsDLList.h
@@ -434,7 +434,7 @@ inline void tsDLList<T>::push (T &item)
 
 //
 // tsDLList<T>::find ()
-// returns -1 if the item isnt on the list
+// returns -1 if the item isn't on the list
 // and the node number (beginning with zero if
 // it is)
 //
diff --git a/modules/libcom/src/cxxTemplates/tsFreeList.h b/modules/libcom/src/cxxTemplates/tsFreeList.h
index 94c8ec769..f1223fa27 100644
--- a/modules/libcom/src/cxxTemplates/tsFreeList.h
+++ b/modules/libcom/src/cxxTemplates/tsFreeList.h
@@ -44,7 +44,7 @@
 //
 // NOTES:
 //
-// 1) A NOOP mutex class may be specified if mutual exclusion isnt required
+// 1) A NOOP mutex class may be specified if mutual exclusion isn't required
 //
 // 2) If you wish to force use of the new operator, then declare your class's
 // destructor as a protected member function.
diff --git a/modules/libcom/src/dbmf/dbmf.c b/modules/libcom/src/dbmf/dbmf.c
index 346dde7aa..0a14f8919 100644
--- a/modules/libcom/src/dbmf/dbmf.c
+++ b/modules/libcom/src/dbmf/dbmf.c
@@ -11,7 +11,7 @@
  * Author: Jim Kowalkowski and Marty Kraimer
  * Date:   4/97
  *
- * Intended for applications that create and free requently
+ * Intended for applications that create and free frequently
  *
  */
 
diff --git a/modules/libcom/src/dbmf/dbmf.h b/modules/libcom/src/dbmf/dbmf.h
index 082973a84..f1df3d31c 100644
--- a/modules/libcom/src/dbmf/dbmf.h
+++ b/modules/libcom/src/dbmf/dbmf.h
@@ -21,7 +21,7 @@
  *
  * Routines whin iocCore like dbLoadDatabase() have the following attributes:
  * 	- They repeatedly call malloc() followed soon afterwards by a call to
- * 	free() the temporaryily allocated storage.
+ * 	free() the temporarily allocated storage.
  * 	- Between those calls to malloc() and free(), additional calls to
  * 	malloc() are made that do NOT have an associated free().
  *
diff --git a/modules/libcom/src/ellLib/ellLib.c b/modules/libcom/src/ellLib/ellLib.c
index b35a77c27..c0e257747 100644
--- a/modules/libcom/src/ellLib/ellLib.c
+++ b/modules/libcom/src/ellLib/ellLib.c
@@ -39,9 +39,9 @@ void ellAdd (ELLLIST *pList, ELLNODE *pNode)
 }
 /****************************************************************************
  *
- * This function concatinates the second linked list to the end of the first
+ * This function concatenates the second linked list to the end of the first
  * list.  The second list is left empty.  Either list (or both) lists may
- * be empty at the begining of the operation.
+ * be empty at the beginning of the operation.
  *
  *****************************************************************************/
 void ellConcat (ELLLIST *pDstList, ELLLIST *pAddList)
diff --git a/modules/libcom/src/error/errlog.c b/modules/libcom/src/error/errlog.c
index 073cb9950..90241c473 100644
--- a/modules/libcom/src/error/errlog.c
+++ b/modules/libcom/src/error/errlog.c
@@ -535,7 +535,7 @@ void errlogFlush(void)
     if (pvtData.atExit)
         return;
 
-   /*If nothing in queue dont wake up errlogThread*/
+   /*If nothing in queue don't wake up errlogThread*/
     epicsMutexMustLock(pvtData.msgQueueLock);
     count = ellCount(&pvtData.msgQueue);
     epicsMutexUnlock(pvtData.msgQueueLock);
diff --git a/modules/libcom/src/fdmgr/fdManager.cpp b/modules/libcom/src/fdmgr/fdManager.cpp
index e23ad1075..225fd7985 100644
--- a/modules/libcom/src/fdmgr/fdManager.cpp
+++ b/modules/libcom/src/fdmgr/fdManager.cpp
@@ -159,7 +159,7 @@ LIBCOM_API void fdManager::process (double delay)
                 if (this->pCBReg != NULL) {
                     //
                     // check only after we see that it is non-null so
-                    // that we dont trigger bounds-checker dangling pointer
+                    // that we don't trigger bounds-checker dangling pointer
                     // error
                     //
                     assert (this->pCBReg==pReg);
@@ -177,8 +177,8 @@ LIBCOM_API void fdManager::process (double delay)
         else if ( status < 0 ) {
             int errnoCpy = SOCKERRNO;
 
-            // dont depend on flags being properly set if
-            // an error is retuned from select
+            // don't depend on flags being properly set if
+            // an error is returned from select
             for ( size_t i = 0u; i < fdrNEnums; i++ ) {
                 FD_ZERO ( &fdSetsPtr[i] );
             }
diff --git a/modules/libcom/src/fdmgr/fdmgr.cpp b/modules/libcom/src/fdmgr/fdmgr.cpp
index b4c170dae..bc62ba9b2 100644
--- a/modules/libcom/src/fdmgr/fdmgr.cpp
+++ b/modules/libcom/src/fdmgr/fdmgr.cpp
@@ -318,7 +318,7 @@ extern "C" LIBCOM_API int epicsStdCall fdmgr_delete (fdctx *pfdctx)
 }
 
 /*
- * depricated interface
+ * deprecated interface
  */
 extern "C" LIBCOM_API int epicsStdCall fdmgr_clear_fd (fdctx *pfdctx, SOCKET fd)
 {
@@ -326,7 +326,7 @@ extern "C" LIBCOM_API int epicsStdCall fdmgr_clear_fd (fdctx *pfdctx, SOCKET fd)
 }
 
 /*
- * depricated interface
+ * deprecated interface
  */
 extern "C" LIBCOM_API int epicsStdCall fdmgr_add_fd ( 
     fdctx   *pfdctx, SOCKET  fd, void (*pfunc)(void *pParam), void *param)
diff --git a/modules/libcom/src/fdmgr/fdmgr.h b/modules/libcom/src/fdmgr/fdmgr.h
index 0930f0e6c..b0341094f 100644
--- a/modules/libcom/src/fdmgr/fdmgr.h
+++ b/modules/libcom/src/fdmgr/fdmgr.h
@@ -117,7 +117,7 @@ void            *param      /* first parameter passed to the func   */
 
 /*
  *
- * Clear nterest in a type of file descriptor activity (IO).
+ * Clear interest in a type of file descriptor activity (IO).
  *
  */
 LIBCOM_API int epicsStdCall fdmgr_clear_callback(
diff --git a/modules/libcom/src/flex/dfa.c b/modules/libcom/src/flex/dfa.c
index c92680b99..03f2011a7 100644
--- a/modules/libcom/src/flex/dfa.c
+++ b/modules/libcom/src/flex/dfa.c
@@ -128,7 +128,7 @@ void check_trailing_context(int *nfa_states, int num_states, int *accset, int na
 
 /* dump_associated_rules - list the rules associated with a DFA state
  *
- * synopisis
+ * synopsis
  *     int ds;
  *     FILE *file;
  *     dump_associated_rules( file, ds );
@@ -179,7 +179,7 @@ void dump_associated_rules(FILE *file, int ds)
 
 /* dump_transitions - list the transitions associated with a DFA state
  *
- * synopisis
+ * synopsis
  *     int state[numecs];
  *     FILE *file;
  *     dump_transitions( file, state );
@@ -449,7 +449,7 @@ void ntod(void)
      * since for them we don't have a simple state number lying around with
      * which to index the table.  We also don't bother doing it for scanners
      * unless (1) NUL is in its own equivalence class (indicated by a
-     * positive value of ecgroup[NUL]), (2) NUL's equilvalence class is
+     * positive value of ecgroup[NUL]), (2) NUL's equivalence class is
      * the last equivalence class, and (3) the number of equivalence classes
      * is the same as the number of characters.  This latter case comes about
      * when useecs is false or when its true but every character still
diff --git a/modules/libcom/src/flex/flexdef.h b/modules/libcom/src/flex/flexdef.h
index a541a2fe0..0a9736e6c 100644
--- a/modules/libcom/src/flex/flexdef.h
+++ b/modules/libcom/src/flex/flexdef.h
@@ -602,7 +602,7 @@ void *reallocate_array(void *array, int size, int element_size);
 #define reallocate_character_array(array,size) \
     (Char *) reallocate_array( (void *) array, size, sizeof( Char ) )
 
-#if 0 /* JRW this might couse truuble... but not for IOC usage */
+#if 0 /* JRW this might couse trouble... but not for IOC usage */
 /* used to communicate between scanner and parser.  The type should really
  * be YYSTYPE, but we can't easily get our hands on it.
  */
diff --git a/modules/libcom/src/iocsh/iocsh.h b/modules/libcom/src/iocsh/iocsh.h
index a6fb50200..261866216 100644
--- a/modules/libcom/src/iocsh/iocsh.h
+++ b/modules/libcom/src/iocsh/iocsh.h
@@ -92,13 +92,13 @@ LIBCOM_API int epicsStdCall iocsh(const char *pathname);
 LIBCOM_API int epicsStdCall iocshCmd(const char *cmd);
 /** Read and evaluate IOC shell commands from the given file.
  * \param pathname Path to script file
- * \param macros NULL or a comma seperated list of macro definitions.  eg. "VAR1=x,VAR2=y"
+ * \param macros NULL or a comma separated list of macro definitions.  eg. "VAR1=x,VAR2=y"
  * \return 0 on success, non-zero on error
  */
 LIBCOM_API int epicsStdCall iocshLoad(const char *pathname, const char* macros);
 /** Evaluate a single IOC shell command
  * \param cmd Command string.  eg. "echo \"something or other\""
- * \param macros NULL or a comma seperated list of macro definitions.  eg. "VAR1=x,VAR2=y"
+ * \param macros NULL or a comma separated list of macro definitions.  eg. "VAR1=x,VAR2=y"
  * \return 0 on success, non-zero on error
  */
 LIBCOM_API int epicsStdCall iocshRun(const char *cmd, const char* macros);
diff --git a/modules/libcom/src/log/iocLog.c b/modules/libcom/src/log/iocLog.c
index 1caef654e..918ce8ec9 100644
--- a/modules/libcom/src/log/iocLog.c
+++ b/modules/libcom/src/log/iocLog.c
@@ -127,7 +127,7 @@ int epicsStdCall iocLogInit (void)
         return iocLogSuccess;
     }
     /*
-     * dont init twice
+     * don't init twice
      */
     if (iocLogClient!=NULL) {
         return iocLogSuccess;
diff --git a/modules/libcom/src/log/iocLogServer.c b/modules/libcom/src/log/iocLogServer.c
index 08f9eca5f..0cee3a169 100644
--- a/modules/libcom/src/log/iocLogServer.c
+++ b/modules/libcom/src/log/iocLogServer.c
@@ -261,7 +261,7 @@ static int seekLatestLine (struct ioc_log_server *pserver)
                 static const int tm_epoch_year = 1900;
                 if (theDate.tm_year>tm_epoch_year) {
                     theDate.tm_year -= tm_epoch_year;
-                    theDate.tm_isdst = -1; /* dont know */
+                    theDate.tm_isdst = -1; /* don't know */
                     lineTime = mktime (&theDate);
                     if ( lineTime != invalidTime ) {
                         if (theLatestTime == invalidTime ||
@@ -590,7 +590,7 @@ static void writeMessagesToLog (struct iocLogClient *pclient)
          * find the first carrage return and create
          * an entry in the log for the message associated
          * with it. If a carrage return does not exist and
-         * the buffer isnt full then move the partial message
+         * the buffer isn't full then move the partial message
          * to the front of the buffer and wait for a carrage
          * return to arrive. If the buffer is full and there
          * is no carrage return then force the message out and
diff --git a/modules/libcom/src/macLib/macCore.c b/modules/libcom/src/macLib/macCore.c
index 9dd5927dd..7c3cf0690 100644
--- a/modules/libcom/src/macLib/macCore.c
+++ b/modules/libcom/src/macLib/macCore.c
@@ -54,7 +54,7 @@ typedef struct mac_entry {
 /*** Local function prototypes ***/
 
 /*
- * These static functions peform low-level operations on macro entries
+ * These static functions perform low-level operations on macro entries
  */
 static MAC_ENTRY *first   ( MAC_HANDLE *handle );
 static MAC_ENTRY *last    ( MAC_HANDLE *handle );
diff --git a/modules/libcom/src/misc/adjustment.c b/modules/libcom/src/misc/adjustment.c
index 5873e5278..a5803c4e2 100644
--- a/modules/libcom/src/misc/adjustment.c
+++ b/modules/libcom/src/misc/adjustment.c
@@ -18,7 +18,7 @@
 /* Up to now epicsShareThings have been declared as imports
  *   (Appropriate for other stuff)
  * After setting the following they will be declared as exports
- *   (Appropriate for what we implenment)
+ *   (Appropriate for what we implement)
  */
 #include "adjustment.h"
 
diff --git a/modules/libcom/src/misc/dbDefs.h b/modules/libcom/src/misc/dbDefs.h
index 2b87793f2..29aabe697 100644
--- a/modules/libcom/src/misc/dbDefs.h
+++ b/modules/libcom/src/misc/dbDefs.h
@@ -50,7 +50,7 @@
 /** \brief Find parent object from a member pointer
  *
  * Subtracts the byte offset of the member in the structure from the
- * pointer to the member itself, giving a pointer to parent strucure.
+ * pointer to the member itself, giving a pointer to parent structure.
  * \param ptr Pointer to a member data field of a structure
  * \param structure Type name of the parent structure
  * \param member Field name of the data member
diff --git a/modules/libcom/src/misc/epicsStdlib.c b/modules/libcom/src/misc/epicsStdlib.c
index ad579511a..629e55765 100644
--- a/modules/libcom/src/misc/epicsStdlib.c
+++ b/modules/libcom/src/misc/epicsStdlib.c
@@ -1,5 +1,5 @@
 /*************************************************************************\
-* Copyright (c) 2012 UChicago Argonna LLC, as Operator of Argonne
+* Copyright (c) 2012 UChicago Argonne LLC, as Operator of Argonne
 *     National Laboratory.
 * Copyright (c) 2002 The Regents of the University of California, as
 *     Operator of Los Alamos National Laboratory.
diff --git a/modules/libcom/src/misc/epicsStdlib.h b/modules/libcom/src/misc/epicsStdlib.h
index e3cb69f91..660ad9abc 100644
--- a/modules/libcom/src/misc/epicsStdlib.h
+++ b/modules/libcom/src/misc/epicsStdlib.h
@@ -15,7 +15,7 @@
 
 /** 
  * \file epicsStdlib.h
- * \brief Functions to convert strings to primative types
+ * \brief Functions to convert strings to primitive types
  *
  * These routines convert a string into an integer of the indicated type and 
  * number base, or into a floating point type. The units pointer argument may 
@@ -163,7 +163,7 @@ LIBCOM_API int
 #define epicsParseFloat64(str, to, units) epicsParseDouble(str, to, units)
 
 /* These macros return 1 if successful, 0 on failure.
- * This is analagous to the return value from sscanf()
+ * This is analogous to the return value from sscanf()
  */
 
 /**  
diff --git a/modules/libcom/src/misc/epicsString.c b/modules/libcom/src/misc/epicsString.c
index be6463438..ca61d9b8c 100644
--- a/modules/libcom/src/misc/epicsString.c
+++ b/modules/libcom/src/misc/epicsString.c
@@ -26,7 +26,7 @@
 #ifndef vxWorks
 #include <stdint.h>
 #else
-/* VxWorks automaticaly includes stdint.h defining SIZE_MAX in 6.9 but not earlier */
+/* VxWorks automatically includes stdint.h defining SIZE_MAX in 6.9 but not earlier */
 #ifndef SIZE_MAX
 #define SIZE_MAX (size_t)-1
 #endif
diff --git a/modules/libcom/src/misc/epicsTypes.h b/modules/libcom/src/misc/epicsTypes.h
index 09e550d78..c3f713ed3 100644
--- a/modules/libcom/src/misc/epicsTypes.h
+++ b/modules/libcom/src/misc/epicsTypes.h
@@ -59,7 +59,7 @@ typedef epicsInt32      epicsStatus;
 #define MAX_STRING_SIZE 40
 
 /**
- * \brief !! Dont use this - it may vanish in the future !!
+ * \brief !! Don't use this - it may vanish in the future !!
  */
 typedef struct {
     unsigned    length;
@@ -67,7 +67,7 @@ typedef struct {
 } epicsString;
 
 /**
- * \brief !! Dont use this - it may vanish in the future !!
+ * \brief !! Don't use this - it may vanish in the future !!
  *
  * Provided only for backwards compatibility with
  * db_access.h
diff --git a/modules/libcom/src/misc/epicsUnitTest.c b/modules/libcom/src/misc/epicsUnitTest.c
index 45a060b94..a15af0a95 100644
--- a/modules/libcom/src/misc/epicsUnitTest.c
+++ b/modules/libcom/src/misc/epicsUnitTest.c
@@ -99,7 +99,7 @@ static void testOnce(void *dummy) {
 #ifdef HAVE_SETERROMODE
     /* SEM_FAILCRITICALERRORS - Don't display modal dialog
      * !SEM_NOALIGNMENTFAULTEXCEPT - auto-fix unaligned access
-     * !SEM_NOGPFAULTERRORBOX - enable Windows Error Reporting (also enables post-mortem debugger hooks)
+     * !SEM_NOGPFAULTERRORBOX - enable Windows Error Reporting (also enables postmortem debugger hooks)
      * SEM_NOOPENFILEERRORBOX - Don't display modal dialog
      */
     SetErrorMode(SEM_FAILCRITICALERRORS|SEM_NOOPENFILEERRORBOX);
diff --git a/modules/libcom/src/misc/epicsUnitTest.h b/modules/libcom/src/misc/epicsUnitTest.h
index 11c7aef61..66dd8f281 100644
--- a/modules/libcom/src/misc/epicsUnitTest.h
+++ b/modules/libcom/src/misc/epicsUnitTest.h
@@ -47,7 +47,7 @@
  * be recorded as failures.
  *
  * Additional information can be supplied using the testDiag() routine, which
- * displays the relevent information as a comment in the result output. None of
+ * displays the relevant information as a comment in the result output. None of
  * the printable strings passed to any testXxx() routine should contain a newline
  * '\n' character, newlines will be added by the test routines as part of the
  * Test Anything Protocol. For multiple lines of diagnostic output, call
@@ -80,7 +80,7 @@
  * server) can not be shut down cleanly. The function iocBuildIsolated() allows
  * to start an IOC without its Channel Access parts, so that it can be shutdown
  * quite cleanly using iocShutdown(). This feature is only intended to be used
- * from test programs, do not use it on productional IOCs. After building the
+ * from test programs, do not use it on production IOCs. After building the
  * IOC using iocBuildIsolated() or iocBuild(), it has to be started by calling
  * iocRun(). The suggested call sequence in a test program that needs to run the
  * IOC without Channel Access is:
@@ -238,7 +238,7 @@ LIBCOM_API int  testDiag(const char *fmt, ...)
  */
 LIBCOM_API int  testDone(void);
 
-/** \brief Return non-zero in shared/oversubscribed testing envrionments
+/** \brief Return non-zero in shared/oversubscribed testing environments
  *
  * May be used to testSkip(), or select longer timeouts, for some cases
  * when the test process may be preempted for arbitrarily long times.
diff --git a/modules/libcom/src/misc/ipAddrToAsciiAsynchronous.cpp b/modules/libcom/src/misc/ipAddrToAsciiAsynchronous.cpp
index bf730fec4..b5e863d59 100644
--- a/modules/libcom/src/misc/ipAddrToAsciiAsynchronous.cpp
+++ b/modules/libcom/src/misc/ipAddrToAsciiAsynchronous.cpp
@@ -338,7 +338,7 @@ void ipAddrToAsciiGlobal::run ()
 
             {
                 epicsGuardRelease < epicsMutex > unguard ( guard );
-                // dont call callback with lock applied
+                // don't call callback with lock applied
                 pCur->pCB->transactionComplete ( this->nameTmp );
             }
 
diff --git a/modules/libcom/src/misc/shareLib.h b/modules/libcom/src/misc/shareLib.h
index 721dc07ff..3b049439b 100644
--- a/modules/libcom/src/misc/shareLib.h
+++ b/modules/libcom/src/misc/shareLib.h
@@ -74,7 +74,7 @@
  *
  * By default shareLib.h sets the DLL import / export keywords to import from
  * a DLL so that, for DLL consumers (users), nothing special must be done. However,
- * DLL implementors must set epicsExportSharedSymbols as above to specify
+ * DLL implementers must set epicsExportSharedSymbols as above to specify
  * which functions are exported from the DLL and which of them are imported
  * from other DLLs.
  *
diff --git a/modules/libcom/src/misc/truncateFile.c b/modules/libcom/src/misc/truncateFile.c
index 866432f1a..0cea958b6 100644
--- a/modules/libcom/src/misc/truncateFile.c
+++ b/modules/libcom/src/misc/truncateFile.c
@@ -21,7 +21,7 @@
 #endif
 
 /*
- * truncate to specified size (we dont use truncate()
+ * truncate to specified size (we don't use truncate()
  * because it is not portable)
  */
 LIBCOM_API enum TF_RETURN  truncateFile (const char *pFileName, unsigned long size)
diff --git a/modules/libcom/src/osi/compiler/default/compilerSpecific.h b/modules/libcom/src/osi/compiler/default/compilerSpecific.h
index 21eec60dc..253f972e1 100644
--- a/modules/libcom/src/osi/compiler/default/compilerSpecific.h
+++ b/modules/libcom/src/osi/compiler/default/compilerSpecific.h
@@ -17,7 +17,7 @@
 #ifndef compilerSpecific_h
 #define compilerSpecific_h
 
-/* The 'inline' key work, possibily with compiler
+/* The 'inline' keyword, possibly with compiler
  * dependent flags to force inlineing where it would
  * otherwise not be done.
  *
diff --git a/modules/libcom/src/osi/compiler/gcc/compilerSpecific.h b/modules/libcom/src/osi/compiler/gcc/compilerSpecific.h
index 43d4dc8f2..6e98f4d17 100644
--- a/modules/libcom/src/osi/compiler/gcc/compilerSpecific.h
+++ b/modules/libcom/src/osi/compiler/gcc/compilerSpecific.h
@@ -33,7 +33,7 @@
 #ifdef __cplusplus
 
 /*
- * in general we dont like ifdefs but they do allow us to check the
+ * in general we don't like ifdefs but they do allow us to check the
  * compiler version and make the optimistic assumption that
  * standards incompliance issues will be fixed by future compiler
  * releases
diff --git a/modules/libcom/src/osi/compiler/msvc/compilerSpecific.h b/modules/libcom/src/osi/compiler/msvc/compilerSpecific.h
index 8215c16bc..7e5bfe609 100644
--- a/modules/libcom/src/osi/compiler/msvc/compilerSpecific.h
+++ b/modules/libcom/src/osi/compiler/msvc/compilerSpecific.h
@@ -29,7 +29,7 @@
 #ifdef __cplusplus
 
 /*
- * in general we dont like ifdefs but they do allow us to check the
+ * in general we don't like ifdefs but they do allow us to check the
  * compiler version and make the optimistic assumption that
  * standards incompliance issues will be fixed by future compiler
  * releases
diff --git a/modules/libcom/src/osi/devLibVME.c b/modules/libcom/src/osi/devLibVME.c
index 9b228d350..e4d8bd244 100644
--- a/modules/libcom/src/osi/devLibVME.c
+++ b/modules/libcom/src/osi/devLibVME.c
@@ -149,7 +149,7 @@ long devBusToLocalAddr(
     volatile void *localAddress;
 
     /*
-     * Make sure that devLib has been intialized
+     * Make sure that devLib has been initialized
      */
     if (!devLibInitFlag) {
         status = devLibInit();
@@ -264,7 +264,7 @@ long devRegisterAddress(
  * devReadProbe()
  *
  * a bus error safe "wordSize" read at the specified address which returns
- * unsuccessful status if the device isnt present
+ * unsuccessful status if the device isn't present
  */
 long devReadProbe (unsigned wordSize, volatile const void *ptr, void *pValue)
 {
@@ -284,7 +284,7 @@ long devReadProbe (unsigned wordSize, volatile const void *ptr, void *pValue)
  * devWriteProbe
  *
  * a bus error safe "wordSize" write at the specified address which returns
- * unsuccessful status if the device isnt present
+ * unsuccessful status if the device isn't present
  */
 long devWriteProbe (unsigned wordSize, volatile void *ptr, const void *pValue)
 {
@@ -1112,7 +1112,7 @@ long locationProbe (epicsAddressType addrType, char *pLocation)
 
 /******************************************************************************
  *
- * The follwing may, or may not be present in the BSP for the CPU in use.
+ * The following may, or may not be present in the BSP for the CPU in use.
  *
  */
 /******************************************************************************
diff --git a/modules/libcom/src/osi/devLibVME.h b/modules/libcom/src/osi/devLibVME.h
index d491f4297..87d172a8a 100644
--- a/modules/libcom/src/osi/devLibVME.h
+++ b/modules/libcom/src/osi/devLibVME.h
@@ -67,7 +67,7 @@ extern "C" {
 
 /** \brief Print a map of registered bus addresses.
  *
- * Display a table of registsred bus address ranges, including the owner of
+ * Display a table of registered bus address ranges, including the owner of
  * each registered address.
  * \return 0, or an error status value
  */
@@ -246,7 +246,7 @@ LIBCOM_API int devInterruptInUseVME (unsigned vectorNumber);
 /** \brief Enable a VME interrupt level onto the CPU.
  *
  * The VMEbus allows multiple CPU boards to be installed in the same
- * backplane. When this is done, the differente VME interrupt levels
+ * backplane. When this is done, the different VME interrupt levels
  * must be assigned to the CPUs since they cannot be shared. This
  * routine tells the VME interface that it should connect interrupts
  * from the indicated interrupt level to a CPU interrupt line.
diff --git a/modules/libcom/src/osi/devLibVMEImpl.h b/modules/libcom/src/osi/devLibVMEImpl.h
index e58f3a2b1..5b1a6b9d7 100644
--- a/modules/libcom/src/osi/devLibVMEImpl.h
+++ b/modules/libcom/src/osi/devLibVMEImpl.h
@@ -31,7 +31,7 @@ extern "C" {
  * \brief A table of function pointers for devLibVME implementations
  *
  * The global virtual OS table \ref pdevLibVME controls
- * the behaviour of the functions defined in devLib.h.
+ * the behavior of the functions defined in devLib.h.
  * All of which call into the functions found in this table
  * to perform system specific tasks.
  */
diff --git a/modules/libcom/src/osi/epicsAssert.h b/modules/libcom/src/osi/epicsAssert.h
index e51463048..7b524f7af 100644
--- a/modules/libcom/src/osi/epicsAssert.h
+++ b/modules/libcom/src/osi/epicsAssert.h
@@ -34,7 +34,7 @@
  *
  * This header also provides a compile-time assertion macro STATIC_ASSERT()
  * which can be used to check a constant-expression at compile-time. The C or
- * C++ compiler will flag an error if the expresstion evaluates to 0. The
+ * C++ compiler will flag an error if the expression evaluates to 0. The
  * STATIC_ASSERT() macro can only be used where a \c typedef is syntactically
  * legal.
  **/
diff --git a/modules/libcom/src/osi/epicsAtomicGCC.h b/modules/libcom/src/osi/epicsAtomicGCC.h
index 006d6a27e..e08d04d7c 100644
--- a/modules/libcom/src/osi/epicsAtomicGCC.h
+++ b/modules/libcom/src/osi/epicsAtomicGCC.h
@@ -20,7 +20,7 @@
 #ifndef INC_epicsAtomicGCC_H
 #define INC_epicsAtomicGCC_H
 
-/* expands __GCC_HAVE_SYNC_COMPARE_AND_SWAP_ concatentating
+/* expands __GCC_HAVE_SYNC_COMPARE_AND_SWAP_ concatenating
  * the numeric value __SIZEOF_*__
  */
 #define GCC_ATOMIC_CONCAT( A, B ) GCC_ATOMIC_CONCATR(A,B)
diff --git a/modules/libcom/src/osi/epicsEvent.cpp b/modules/libcom/src/osi/epicsEvent.cpp
index 1c05bba90..d8b2533eb 100644
--- a/modules/libcom/src/osi/epicsEvent.cpp
+++ b/modules/libcom/src/osi/epicsEvent.cpp
@@ -34,7 +34,7 @@ const char * epicsEvent::invalidSemaphore::what () const throw ()
 
 //
 // Its probably preferable to not make these inline because they are in
-// the sharable library interface. The use of inline or not here is probably
+// the shareable library interface. The use of inline or not here is probably
 // not an issue because all of this ends up in the operating system in system
 // calls
 //
diff --git a/modules/libcom/src/osi/epicsEvent.h b/modules/libcom/src/osi/epicsEvent.h
index a5d1e79e4..8cc16fe61 100644
--- a/modules/libcom/src/osi/epicsEvent.h
+++ b/modules/libcom/src/osi/epicsEvent.h
@@ -13,7 +13,7 @@
  * \brief APIs for the epicsEvent binary semaphore.
  *
  * Defines the C++ and C API's for a simple binary semaphore. If multiple threads are
- * waiting on the same event, only one of them will be woken when the event is signalled.
+ * waiting on the same event, only one of them will be woken when the event is signaled.
  *
  * The primary use of an event semaphore is for thread synchronization. An example of using an
  * event semaphore is a consumer thread that processes requests from one or more producer threads.
@@ -103,13 +103,13 @@ public:
      * \return True if the event was triggered, False if it timed out.
      **/
     bool wait ( double timeOut );
-    /**\brief Similar to wait() except that if the event is currenly empty the
+    /**\brief Similar to wait() except that if the event is currently empty the
      * call will return immediately.
      * \return True if the event was full (triggered), False if empty.
      **/
     bool tryWait ();
     /**\brief Display information about the semaphore.
-     * \note The information displayed is architecture dependant.
+     * \note The information displayed is architecture dependent.
      * \param level An unsigned int for the level of information to be displayed.
      **/
     void show ( unsigned level ) const;
@@ -196,7 +196,7 @@ LIBCOM_API void epicsEventMustWait(epicsEventId id);
 LIBCOM_API epicsEventStatus epicsEventWaitWithTimeout(
     epicsEventId id, double timeOut);
 
-/**\brief Similar to wait() except that if the event is currenly empty the
+/**\brief Similar to wait() except that if the event is currently empty the
  * call will return immediately with status \c epicsEventWaitTimeout.
  * \param id The event identifier.
  * \return Status indicator, \c epicsEventWaitTimeout when the event is empty.
@@ -205,7 +205,7 @@ LIBCOM_API epicsEventStatus epicsEventTryWait(
     epicsEventId id);
 
 /**\brief Display information about the semaphore.
- * \note The information displayed is architecture dependant.
+ * \note The information displayed is architecture dependent.
  * \param id The event identifier.
  * \param level An unsigned int for the level of information to be displayed.
  **/
diff --git a/modules/libcom/src/osi/epicsGeneralTime.h b/modules/libcom/src/osi/epicsGeneralTime.h
index 7e4a48d50..fe91475cf 100644
--- a/modules/libcom/src/osi/epicsGeneralTime.h
+++ b/modules/libcom/src/osi/epicsGeneralTime.h
@@ -56,7 +56,7 @@ extern "C" {
  **/
 #define NUM_TIME_EVENTS 256
 
-/**\brief Initialise the framework.
+/**\brief Initialize the framework.
  *
  * This routine is called automatically by any function that requires the
  * framework. It does not need to be called explicitly.
diff --git a/modules/libcom/src/osi/epicsMath.cpp b/modules/libcom/src/osi/epicsMath.cpp
index dc45bc1a1..7835420c6 100644
--- a/modules/libcom/src/osi/epicsMath.cpp
+++ b/modules/libcom/src/osi/epicsMath.cpp
@@ -1,5 +1,5 @@
 /*************************************************************************\
-* Copyright (c) 2010 UChicago Argonna LLC, as Operator of Argonne
+* Copyright (c) 2010 UChicago Argonne LLC, as Operator of Argonne
 *     National Laboratory.
 * SPDX-License-Identifier: EPICS
 * EPICS BASE is distributed subject to a Software License Agreement found
diff --git a/modules/libcom/src/osi/epicsMutex.h b/modules/libcom/src/osi/epicsMutex.h
index fc47eda0c..41f73a4bc 100644
--- a/modules/libcom/src/osi/epicsMutex.h
+++ b/modules/libcom/src/osi/epicsMutex.h
@@ -27,7 +27,7 @@
          epicsMutex::guard_t G(lock); // lock
          // process resources
      } // unlock
-     // or for compatiblity
+     // or for compatibility
      {
          epicsGuard<epicsMutex> G(lock); // lock
          // process resources
@@ -99,7 +99,7 @@ public:
 
     /**\brief Display information about the semaphore.
      *
-     * \note Results are architecture dependant.
+     * \note Results are architecture dependent.
      *
      * \param level Desired information level to report
      **/
@@ -229,7 +229,7 @@ LIBCOM_API epicsMutexLockStatus epicsStdCall epicsMutexTryLock(
 
 /**\brief Display information about the semaphore.
  *
- * \note Results are architecture dependant.
+ * \note Results are architecture dependent.
  *
  * \param id The mutex identifier.
  * \param level Desired information level to report
@@ -239,7 +239,7 @@ LIBCOM_API void epicsStdCall epicsMutexShow(
 
 /**\brief Display information about all epicsMutex semaphores.
  *
- * \note Results are architecture dependant.
+ * \note Results are architecture dependent.
  *
  * \param onlyLocked Non-zero to show only locked semaphores.
  * \param level Desired information level to report
diff --git a/modules/libcom/src/osi/epicsStdio.h b/modules/libcom/src/osi/epicsStdio.h
index 9bb5eb3e0..97afa3405 100644
--- a/modules/libcom/src/osi/epicsStdio.h
+++ b/modules/libcom/src/osi/epicsStdio.h
@@ -9,14 +9,14 @@
 \*************************************************************************/
 /**
  * \file epicsStdio.h
- * \brief Standardize the behaviour of stdio across EPICS targets
+ * \brief Standardize the behavior of stdio across EPICS targets
  *
  * \details
  * The `epicsStdio.h` header includes the operating system's `stdio.h` header
  * and if used should replace it.
  *
  * epicsSnprintf() and epicsVsnprintf() have the same semantics as the C99
- * functions snprintf() and vsnprintf(), but correct the behaviour of the
+ * functions snprintf() and vsnprintf(), but correct the behavior of the
  * implementations on some operating systems.
  *
  * The routines epicsGetStdin(), epicsGetStdout(), epicsGetStderr(),
diff --git a/modules/libcom/src/osi/epicsStdioRedirect.h b/modules/libcom/src/osi/epicsStdioRedirect.h
index 88857cc72..8e116c8eb 100644
--- a/modules/libcom/src/osi/epicsStdioRedirect.h
+++ b/modules/libcom/src/osi/epicsStdioRedirect.h
@@ -10,7 +10,7 @@
 
 /* epicsStdioRedirect.h */
 
-/* This file is now obselete, and is likely to be
+/* This file is now obsolete, and is likely to be
  * deleted in a future release of EPICS Base.
  *
  * Use the epicsStdio.h header file instead.
diff --git a/modules/libcom/src/osi/epicsThread.h b/modules/libcom/src/osi/epicsThread.h
index a9ad476b3..c8035685b 100644
--- a/modules/libcom/src/osi/epicsThread.h
+++ b/modules/libcom/src/osi/epicsThread.h
@@ -15,7 +15,7 @@
  * \brief C++ and C descriptions for a thread.
  *
  * The epicsThread API is meant as a somewhat minimal interface for
- * multithreaded applications. It can be implementedon a wide variety of
+ * multithreaded applications. It can be implemented on a wide variety of
  * systems with the restriction that the system MUST support a
  * multithreaded environment.
  * A POSIX pthreads version is provided.
diff --git a/modules/libcom/src/osi/epicsTime.cpp b/modules/libcom/src/osi/epicsTime.cpp
index 90d4f9810..9d00acec2 100644
--- a/modules/libcom/src/osi/epicsTime.cpp
+++ b/modules/libcom/src/osi/epicsTime.cpp
@@ -206,7 +206,7 @@ size_t epicsStdCall epicsTimeToStrftime (char *pBuff, size_t bufLength, const ch
             bufLenLeft -= strftimeNumChar;
         }
 
-        // fractional seconds formating
+        // fractional seconds formatting
         if ( fracFmtFound && bufLenLeft > 1 ) {
             if ( fracWid > nSecFracDigits ) {
                 fracWid = nSecFracDigits;
@@ -296,7 +296,7 @@ int epicsStdCall epicsTimeToTime_t (time_t *pDest, const epicsTimeStamp *pSrc)
 {
     STATIC_ASSERT(sizeof(*pDest) >= sizeof(pSrc->secPastEpoch));
 
-    // widen to 64-bit to (eventually) accomidate 64-bit time_t
+    // widen to 64-bit to (eventually) accommodate 64-bit time_t
     *pDest = epicsUInt64(pSrc->secPastEpoch) + POSIX_TIME_AT_EPICS_EPOCH;
     return epicsTimeOK;
 }
diff --git a/modules/libcom/src/osi/epicsTime.h b/modules/libcom/src/osi/epicsTime.h
index 8996c3733..05c02cf63 100644
--- a/modules/libcom/src/osi/epicsTime.h
+++ b/modules/libcom/src/osi/epicsTime.h
@@ -231,7 +231,7 @@ LIBCOM_API size_t epicsStdCall epicsTimeToStrftime (
 LIBCOM_API void epicsStdCall epicsTimeShow (
     const epicsTimeStamp *, unsigned interestLevel );
 
-/** \name Reentrant time_t to struct tm conversions
+/** \name Re-entrant time_t to struct tm conversions
  * OS-specific reentrant versions of the ANSI C interface because the
  * vxWorks \c gmtime_r interface does not match POSIX standards
  * @{ */
@@ -480,7 +480,7 @@ public:
      * @{ */
     /** \brief Convert to Windows <tt>struct _FILETIME</tt> */
     operator struct _FILETIME () const;
-    /** \brief Constuct from Windows <tt>struct _FILETIME</tt> */
+    /** \brief Construct from Windows <tt>struct _FILETIME</tt> */
     epicsTime ( const struct _FILETIME & );
     /** \brief Assign from Windows <tt>struct _FILETIME</tt> */
     epicsTime & operator = ( const struct _FILETIME & );
diff --git a/modules/libcom/src/osi/os/Darwin/osdgetexec.c b/modules/libcom/src/osi/os/Darwin/osdgetexec.c
index 688b4c94d..2f2d6e4d5 100644
--- a/modules/libcom/src/osi/os/Darwin/osdgetexec.c
+++ b/modules/libcom/src/osi/os/Darwin/osdgetexec.c
@@ -46,7 +46,7 @@ char *epicsGetExecDir(void)
     if(ret) {
         char *sep = strrchr(ret, '/');
         if(sep) {
-            /* nil the charactor after the / */
+            /* nil the character after the / */
             sep[1] = '\0';
         }
     }
diff --git a/modules/libcom/src/osi/os/Linux/osdgetexec.c b/modules/libcom/src/osi/os/Linux/osdgetexec.c
index 0c48e2f08..0045c43c3 100644
--- a/modules/libcom/src/osi/os/Linux/osdgetexec.c
+++ b/modules/libcom/src/osi/os/Linux/osdgetexec.c
@@ -54,7 +54,7 @@ char *epicsGetExecDir(void)
     if(ret) {
         char *sep = strrchr(ret, '/');
         if(sep) {
-            /* nil the charactor after the / */
+            /* nil the character after the / */
             sep[1] = '\0';
         }
     }
diff --git a/modules/libcom/src/osi/os/RTEMS-score/devLibVMEOSD.c b/modules/libcom/src/osi/os/RTEMS-score/devLibVMEOSD.c
index ed310eebc..a81d7169a 100644
--- a/modules/libcom/src/osi/os/RTEMS-score/devLibVMEOSD.c
+++ b/modules/libcom/src/osi/os/RTEMS-score/devLibVMEOSD.c
@@ -81,13 +81,13 @@ static long rtemsDevMapAddr (epicsAddressType addrType, unsigned options,
 
 /*
  * a bus error safe "wordSize" read at the specified address which returns
- * unsuccessful status if the device isnt present
+ * unsuccessful status if the device isn't present
  */
 static long rtemsDevReadProbe (unsigned wordSize, volatile const void *ptr, void *pValue);
 
 /*
  * a bus error safe "wordSize" write at the specified address which returns
- * unsuccessful status if the device isnt present
+ * unsuccessful status if the device isn't present
  */
 static long rtemsDevWriteProbe (unsigned wordSize, volatile void *ptr, const void *pValue);
 
@@ -306,7 +306,7 @@ rtems_status_code bspExtMemProbe(void *addr, int write, int size, void *pval)
 
 /*
  * a bus error safe "wordSize" read at the specified address which returns
- * unsuccessful status if the device isnt present
+ * unsuccessful status if the device isn't present
  */
 static long rtemsDevReadProbe (unsigned wordSize, volatile const void *ptr, void *pValue)
 {
@@ -322,7 +322,7 @@ static long rtemsDevReadProbe (unsigned wordSize, volatile const void *ptr, void
 
 /*
  * a bus error safe "wordSize" write at the specified address which returns
- * unsuccessful status if the device isnt present
+ * unsuccessful status if the device isn't present
  */
 static long rtemsDevWriteProbe (unsigned wordSize, volatile void *ptr, const void *pValue)
 {
diff --git a/modules/libcom/src/osi/os/RTEMS-score/osdSignal.cpp b/modules/libcom/src/osi/os/RTEMS-score/osdSignal.cpp
index 0195f7b4a..b17930d0e 100644
--- a/modules/libcom/src/osi/os/RTEMS-score/osdSignal.cpp
+++ b/modules/libcom/src/osi/os/RTEMS-score/osdSignal.cpp
@@ -11,7 +11,7 @@
 #include "epicsSignal.h"
 
 /*
- * All NOOPs if the os isnt POSIX
+ * All NOOPs if the os isn't POSIX
  */
 LIBCOM_API void epicsStdCall epicsSignalInstallSigHupIgnore ( void ) {}
 LIBCOM_API void epicsStdCall epicsSignalInstallSigPipeIgnore ( void ) {}
diff --git a/modules/libcom/src/osi/os/RTEMS-score/osdSpin.c b/modules/libcom/src/osi/os/RTEMS-score/osdSpin.c
index 4f587f58a..63f8a5de3 100644
--- a/modules/libcom/src/osi/os/RTEMS-score/osdSpin.c
+++ b/modules/libcom/src/osi/os/RTEMS-score/osdSpin.c
@@ -16,7 +16,7 @@
  *          Andrew Johnson <anj@aps.anl.gov>
  *          Michael Davidsaver <mdavidsaver@bnl.gov>
  *
- * Inspired by Linux UP spinlocks implemention
+ * Inspired by Linux UP spinlocks implementation
  *   include/linux/spinlock_api_up.h
  */
 
diff --git a/modules/libcom/src/osi/os/RTEMS-score/osdThread.c b/modules/libcom/src/osi/os/RTEMS-score/osdThread.c
index 71a532e62..c0f9ba0bd 100644
--- a/modules/libcom/src/osi/os/RTEMS-score/osdThread.c
+++ b/modules/libcom/src/osi/os/RTEMS-score/osdThread.c
@@ -386,7 +386,7 @@ void epicsThreadMustJoin(epicsThreadId id)
             errlogPrintf("Warning: %s thread self-join of unjoinable\n", v ? v->name : "non-EPICS thread");
 
         } else {
-            /* try to error nicely, however in all likelyhood de-ref of
+            /* try to error nicely, however in all likelihood de-ref of
              * 'id' has already caused SIGSEGV as we are racing thread exit,
              * which free's 'id'.
              */
diff --git a/modules/libcom/src/osi/os/WIN32/epicsAtomicMS.h b/modules/libcom/src/osi/os/WIN32/epicsAtomicMS.h
index a2004273a..f036ba6b6 100644
--- a/modules/libcom/src/osi/os/WIN32/epicsAtomicMS.h
+++ b/modules/libcom/src/osi/os/WIN32/epicsAtomicMS.h
@@ -49,7 +49,7 @@ EPICS_ATOMIC_INLINE int epicsAtomicAddIntT ( int * pTarget, int delta )
 {
     STATIC_ASSERT ( sizeof ( MS_LONG ) == sizeof ( int ) );
     MS_LONG * const pTarg = ( MS_LONG * ) ( pTarget );
-    /* we dont use InterlockedAdd because only latest windows is supported */
+    /* we don't use InterlockedAdd because only latest windows is supported */
     return delta + ( int ) MS_InterlockedExchangeAdd ( pTarg,
                                             ( MS_LONG ) delta );
 }
@@ -101,7 +101,7 @@ EPICS_ATOMIC_INLINE size_t epicsAtomicAddSizeT ( size_t * pTarget,
                                                     size_t delta )
 {
     MS_LONG * const pTarg = ( MS_LONG * ) ( pTarget );
-    /* we dont use InterlockedAdd because only latest windows is supported */
+    /* we don't use InterlockedAdd because only latest windows is supported */
     return delta + ( size_t ) MS_InterlockedExchangeAdd ( pTarg,
                                                  ( MS_LONG ) delta );
 }
@@ -113,7 +113,7 @@ EPICS_ATOMIC_INLINE size_t epicsAtomicSubSizeT ( size_t * pTarget, size_t delta
 {
     MS_LONG * const pTarg = ( MS_LONG * ) ( pTarget );
     MS_LONG ldelta = (MS_LONG) delta;
-    /* we dont use InterlockedAdd because only latest windows is supported */
+    /* we don't use InterlockedAdd because only latest windows is supported */
     return ( ( size_t ) MS_InterlockedExchangeAdd ( pTarg, -ldelta ) ) - delta;
 }
 #endif
@@ -172,7 +172,7 @@ EPICS_ATOMIC_INLINE size_t epicsAtomicDecrSizeT ( size_t * pTarget )
 EPICS_ATOMIC_INLINE size_t epicsAtomicAddSizeT ( size_t * pTarget, size_t delta )
 {
     MS_LONGLONG * const pTarg = ( MS_LONGLONG * ) ( pTarget );
-    /* we dont use InterlockedAdd64 because only latest windows is supported */
+    /* we don't use InterlockedAdd64 because only latest windows is supported */
     return delta + ( size_t ) MS_InterlockedExchangeAdd64 ( pTarg,
                                         ( MS_LONGLONG ) delta );
 }
@@ -184,7 +184,7 @@ EPICS_ATOMIC_INLINE size_t epicsAtomicSubSizeT ( size_t * pTarget, size_t delta
 {
     MS_LONGLONG * const pTarg = ( MS_LONGLONG * ) ( pTarget );
     MS_LONGLONG ldelta = (MS_LONGLONG) delta;
-    /* we dont use InterlockedAdd64 because only latest windows is supported */
+    /* we don't use InterlockedAdd64 because only latest windows is supported */
     return (( size_t ) MS_InterlockedExchangeAdd64 ( pTarg, -ldelta )) - delta;
 }
 #endif
diff --git a/modules/libcom/src/osi/os/WIN32/epicsTempFile.c b/modules/libcom/src/osi/os/WIN32/epicsTempFile.c
index 106a5cdba..1a01477ea 100644
--- a/modules/libcom/src/osi/os/WIN32/epicsTempFile.c
+++ b/modules/libcom/src/osi/os/WIN32/epicsTempFile.c
@@ -23,8 +23,8 @@
 /*
  * epicsTmpFile
  *
- * allow the teporary file directory to be set with the
- * TMP environment varianble
+ * allow the temporary file directory to be set with the
+ * TMP environment variable
  */
 LIBCOM_API FILE * epicsStdCall epicsTempFile ()
 {
diff --git a/modules/libcom/src/osi/os/WIN32/forceBadAllocException.cpp b/modules/libcom/src/osi/os/WIN32/forceBadAllocException.cpp
index f26998d2b..446092d6c 100644
--- a/modules/libcom/src/osi/os/WIN32/forceBadAllocException.cpp
+++ b/modules/libcom/src/osi/os/WIN32/forceBadAllocException.cpp
@@ -19,7 +19,7 @@
 #include <new>
 #include <new.h>
 
-// instruct loader to call this gllobal object
+// instruct loader to call this global object
 // constructor before user global object constructors
 #pragma warning (disable: 4073)
 #pragma init_seg(lib)
diff --git a/modules/libcom/src/osi/os/WIN32/osdMonotonic.c b/modules/libcom/src/osi/os/WIN32/osdMonotonic.c
index cff18d0e6..6a9b722c0 100644
--- a/modules/libcom/src/osi/os/WIN32/osdMonotonic.c
+++ b/modules/libcom/src/osi/os/WIN32/osdMonotonic.c
@@ -16,7 +16,7 @@
 
 static epicsUInt64 osdMonotonicResolution;      /* timer resolution in nanoseconds */
 static epicsUInt64 perfCounterFrequency;        /* performance counter tics per second */
-static LONGLONG perfCounterOffset;              /* performance counter value at initialisation */
+static LONGLONG perfCounterOffset;              /* performance counter value at initialization */
 static const epicsUInt64 sec2nsec = 1000000000; /* number of nanoseconds in a second */
 
 void osdMonotonicInit(void)
diff --git a/modules/libcom/src/osi/os/WIN32/osdMutex.c b/modules/libcom/src/osi/os/WIN32/osdMutex.c
index 405a9c741..561093cac 100644
--- a/modules/libcom/src/osi/os/WIN32/osdMutex.c
+++ b/modules/libcom/src/osi/os/WIN32/osdMutex.c
@@ -31,7 +31,7 @@
  * are used. The code does have run time switches so
  * that the more advanced calls are not called unless
  * they are available in the windows OS, but this feature
- * isnt going to be very useful unless we specify "delay
+ * isn't going to be very useful unless we specify "delay
  * loading" when we link with the DLL.
  *
  * It appears that the only entry point used here that causes
diff --git a/modules/libcom/src/osi/os/WIN32/osdNetIntf.c b/modules/libcom/src/osi/os/WIN32/osdNetIntf.c
index d20e987c0..5b3565ad0 100644
--- a/modules/libcom/src/osi/os/WIN32/osdNetIntf.c
+++ b/modules/libcom/src/osi/os/WIN32/osdNetIntf.c
@@ -9,7 +9,7 @@
 \*************************************************************************/
 
 /*
- *      WIN32 specific initialisation for bsd sockets,
+ *      WIN32 specific initialization for bsd sockets,
  *      based on Chris Timossi's base/src/ca/windows_depend.c,
  *      and also further additions by Kay Kasemir when this was in
  *      dllmain.cc
@@ -85,14 +85,14 @@ static void osiLocalAddrOnce ( void *raw )
     for (pIfinfo = pIfinfoList; pIfinfo < (pIfinfoList+numifs); pIfinfo++){
 
         /*
-         * dont use interfaces that have been disabled
+         * don't use interfaces that have been disabled
          */
         if (!(pIfinfo->iiFlags & IFF_UP)) {
             continue;
         }
 
         /*
-         * dont use the loop back interface
+         * don't use the loop back interface
          */
         if (pIfinfo->iiFlags & IFF_LOOPBACK) {
             continue;
@@ -183,7 +183,7 @@ LIBCOM_API void epicsStdCall osiSockDiscoverBroadcastAddresses
     for (pIfinfo = pIfinfoList; pIfinfo < (pIfinfoList+numifs); pIfinfo++){
 
         /*
-         * dont bother with interfaces that have been disabled
+         * don't bother with interfaces that have been disabled
          */
         if (!(pIfinfo->iiFlags & IFF_UP)) {
             continue;
@@ -203,7 +203,7 @@ LIBCOM_API void epicsStdCall osiSockDiscoverBroadcastAddresses
         }
 
         /*
-         * if it isnt a wildcarded interface then look for
+         * if it isn't a wildcarded interface then look for
          * an exact match
          */
         if (pMatchAddr->sa.sa_family != AF_UNSPEC) {
diff --git a/modules/libcom/src/osi/os/WIN32/osdProcess.c b/modules/libcom/src/osi/os/WIN32/osdProcess.c
index cff1ed4bd..a41105d45 100644
--- a/modules/libcom/src/osi/os/WIN32/osdProcess.c
+++ b/modules/libcom/src/osi/os/WIN32/osdProcess.c
@@ -71,7 +71,7 @@ LIBCOM_API osiSpawnDetachedProcessReturn epicsStdCall osiSpawnDetachedProcess
         NULL, /* pointer to thread security attributes */
         FALSE, /* handle inheritance flag */
         CREATE_NEW_PROCESS_GROUP | DETACHED_PROCESS, /* creation flags */
-        NULL, /* pointer to new environment block (defaults to caller's environement) */
+        NULL, /* pointer to new environment block (defaults to caller's environment) */
         NULL, /* pointer to current directory name  (defaults to caller's current directory) */
         &startupInfo, /* pointer to STARTUPINFO */
         &processInfo /* pointer to PROCESS_INFORMATION */
diff --git a/modules/libcom/src/osi/os/WIN32/osdSock.c b/modules/libcom/src/osi/os/WIN32/osdSock.c
index 6b7d6c8b8..8ca80ffb9 100644
--- a/modules/libcom/src/osi/os/WIN32/osdSock.c
+++ b/modules/libcom/src/osi/os/WIN32/osdSock.c
@@ -9,7 +9,7 @@
 \*************************************************************************/
 
 /*
- *      WIN32 specific initialisation for bsd sockets,
+ *      WIN32 specific initialization for bsd sockets,
  *      based on Chris Timossi's base/src/ca/windows_depend.c,
  *      and also further additions by Kay Kasemir when this was in
  *      dllmain.cc
diff --git a/modules/libcom/src/osi/os/WIN32/osdSock.h b/modules/libcom/src/osi/os/WIN32/osdSock.h
index 9eab6e76a..4f35ab56e 100644
--- a/modules/libcom/src/osi/os/WIN32/osdSock.h
+++ b/modules/libcom/src/osi/os/WIN32/osdSock.h
@@ -16,7 +16,7 @@
 
 /*
  * winsock2.h changes the structure alignment to 4 if
- * WIN32 isnt set which can be a source of confusion
+ * WIN32 isn't set which can be a source of confusion
  */
 #ifndef WIN32
 #   define WIN32
@@ -72,7 +72,7 @@ typedef DWORD osiSockOptMcastTTL_t;
  *  Under WIN32, FD_SETSIZE is the max. number of sockets,
  *  not the max. fd value that you use in select().
  *
- *  Therefore, it is difficult to detemine if any given
+ *  Therefore, it is difficult to determine if any given
  *  fd can be used with FD_SET(), FD_CLR(), and FD_ISSET().
  */
 #define FD_IN_FDSET(FD) (1)
diff --git a/modules/libcom/src/osi/os/WIN32/osdThread.c b/modules/libcom/src/osi/os/WIN32/osdThread.c
index cff3e45d4..b001775d9 100644
--- a/modules/libcom/src/osi/os/WIN32/osdThread.c
+++ b/modules/libcom/src/osi/os/WIN32/osdThread.c
@@ -116,13 +116,13 @@ BOOL WINAPI DllMain (
 
     case DLL_THREAD_ATTACH:
         /*
-         * Dont allow user's explicitly calling FreeLibrary for Com.dll to yank
+         * Don't allow user's explicitly calling FreeLibrary for Com.dll to yank
          * the carpet out from under EPICS threads that are still using Com.dll
          */
 #if _WIN32_WINNT >= 0x0501
         /*
          * Only in WXP
-         * Thats a shame because this is probably much faster
+         * That's a shame because this is probably much faster
          */
         success = GetModuleHandleEx (
             GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS,
@@ -653,7 +653,7 @@ void epicsThreadMustJoin(epicsThreadId id)
             fprintf(stderr, "Warning: %s thread self-join of unjoinable\n", pParmWIN32->pName);
 
         } else {
-            /* try to error nicely, however in all likelyhood de-ref of
+            /* try to error nicely, however in all likelihood de-ref of
              * 'id' has already caused SIGSEGV as we are racing thread exit,
              * which free's 'id'.
              */
diff --git a/modules/libcom/src/osi/os/WIN32/osdgetexec.c b/modules/libcom/src/osi/os/WIN32/osdgetexec.c
index ad458e80f..d54f42958 100644
--- a/modules/libcom/src/osi/os/WIN32/osdgetexec.c
+++ b/modules/libcom/src/osi/os/WIN32/osdgetexec.c
@@ -48,7 +48,7 @@ char *epicsGetExecDir(void)
     if(ret) {
         char *sep = strrchr(ret, '\\');
         if(sep) {
-            /* nil the charactor after the / */
+            /* nil the character after the / */
             sep[1] = '\0';
         }
     }
diff --git a/modules/libcom/src/osi/os/cygwin32/systemCallIntMech.cpp b/modules/libcom/src/osi/os/cygwin32/systemCallIntMech.cpp
index 291fb5890..a6ce793a1 100644
--- a/modules/libcom/src/osi/os/cygwin32/systemCallIntMech.cpp
+++ b/modules/libcom/src/osi/os/cygwin32/systemCallIntMech.cpp
@@ -19,7 +19,7 @@ enum epicsSocketSystemCallInterruptMechanismQueryInfo
         epicsSocketSystemCallInterruptMechanismQuery ()
 {
 #if (CYGWIN_VERSION_DLL_MAJOR == 1007) && (CYGWIN_VERSION_DLL_MINOR < 15)
-    // Behaviour changed in early Cygwin 1.7 releases, reverted later.
+    // Behavior changed in early Cygwin 1.7 releases, reverted later.
     return esscimqi_socketCloseRequired;
 #else
     return esscimqi_socketBothShutdownRequired;
diff --git a/modules/libcom/src/osi/os/default/osdSignal.cpp b/modules/libcom/src/osi/os/default/osdSignal.cpp
index 0195f7b4a..b17930d0e 100644
--- a/modules/libcom/src/osi/os/default/osdSignal.cpp
+++ b/modules/libcom/src/osi/os/default/osdSignal.cpp
@@ -11,7 +11,7 @@
 #include "epicsSignal.h"
 
 /*
- * All NOOPs if the os isnt POSIX
+ * All NOOPs if the os isn't POSIX
  */
 LIBCOM_API void epicsStdCall epicsSignalInstallSigHupIgnore ( void ) {}
 LIBCOM_API void epicsStdCall epicsSignalInstallSigPipeIgnore ( void ) {}
diff --git a/modules/libcom/src/osi/os/default/osdSockAddrReuse.cpp b/modules/libcom/src/osi/os/default/osdSockAddrReuse.cpp
index bf4c1e4c0..b2d3906bc 100644
--- a/modules/libcom/src/osi/os/default/osdSockAddrReuse.cpp
+++ b/modules/libcom/src/osi/os/default/osdSockAddrReuse.cpp
@@ -28,7 +28,7 @@ LIBCOM_API void epicsStdCall
      * SO_REUSEADDR compared to other OS. With WINSOCK SO_REUSEADDR indicates
      * that simultaneously servers can bind to the same TCP port on the same host!
      * Also, servers are always enabled to reuse a port immediately after
-     * they exit ( even if SO_REUSEADDR isnt set ).
+     * they exit ( even if SO_REUSEADDR isn't set ).
      */
 #else
     int yes = true;
diff --git a/modules/libcom/src/osi/os/freebsd/osdgetexec.c b/modules/libcom/src/osi/os/freebsd/osdgetexec.c
index 70b0f0a56..1db5cbc94 100644
--- a/modules/libcom/src/osi/os/freebsd/osdgetexec.c
+++ b/modules/libcom/src/osi/os/freebsd/osdgetexec.c
@@ -66,7 +66,7 @@ char *epicsGetExecDir(void)
     if(ret) {
         char *sep = strrchr(ret, '/');
         if(sep) {
-            /* nil the charactor after the / */
+            /* nil the character after the / */
             sep[1] = '\0';
         }
     }
diff --git a/modules/libcom/src/osi/os/posix/osdThread.c b/modules/libcom/src/osi/os/posix/osdThread.c
index 80c53e3e6..3cba2fa67 100644
--- a/modules/libcom/src/osi/os/posix/osdThread.c
+++ b/modules/libcom/src/osi/os/posix/osdThread.c
@@ -272,7 +272,7 @@ int           low, try;
          * at all. However, we still must return
          * a priority range accepted by the SCHED_FIFO
          * policy. Otherwise, epicsThreadCreate() cannot
-         * detect the unsufficient permission (EPERM)
+         * detect the insufficient permission (EPERM)
          * and fall back to a non-RT thread (because
          * pthread_attr_setschedparam would fail with
          * EINVAL due to the bad priority).
@@ -651,7 +651,7 @@ void epicsThreadMustJoin(epicsThreadId id)
             errlogPrintf("Warning: %s thread self-join of unjoinable\n", id->name);
 
         } else {
-            /* try to error nicely, however in all likelyhood de-ref of
+            /* try to error nicely, however in all likelihood de-ref of
              * 'id' has already caused SIGSEGV as we are racing thread exit,
              * which free's 'id'.
              */
diff --git a/modules/libcom/src/osi/os/solaris/osdgetexec.c b/modules/libcom/src/osi/os/solaris/osdgetexec.c
index 748e35ddd..8685e8b46 100644
--- a/modules/libcom/src/osi/os/solaris/osdgetexec.c
+++ b/modules/libcom/src/osi/os/solaris/osdgetexec.c
@@ -26,7 +26,7 @@ char *epicsGetExecDir(void)
     if(ret) {
         char *sep = strrchr(ret, '/');
         if(sep) {
-            /* nil the charactor after the / */
+            /* nil the character after the / */
             sep[1] = '\0';
         }
     }
diff --git a/modules/libcom/src/osi/os/vxWorks/devLibVMEOSD.c b/modules/libcom/src/osi/os/vxWorks/devLibVMEOSD.c
index 1d80f23f6..b2fbbdf9a 100644
--- a/modules/libcom/src/osi/os/vxWorks/devLibVMEOSD.c
+++ b/modules/libcom/src/osi/os/vxWorks/devLibVMEOSD.c
@@ -8,7 +8,7 @@
 * in file LICENSE that is included with this distribution.
 \*************************************************************************/
 /*
- * Archictecture dependent support for common device driver resources
+ * Architecture dependent support for common device driver resources
  *
  *      Author: Jeff Hill
  *      Date: 10-30-98
@@ -99,13 +99,13 @@ static long vxDevMapAddr (epicsAddressType addrType, unsigned options,
 
 /*
  * a bus error safe "wordSize" read at the specified address which returns
- * unsuccessful status if the device isnt present
+ * unsuccessful status if the device isn't present
  */
 static long vxDevReadProbe (unsigned wordSize, volatile const void *ptr, void *pValue);
 
 /*
  * a bus error safe "wordSize" write at the specified address which returns
- * unsuccessful status if the device isnt present
+ * unsuccessful status if the device isn't present
  */
 static long vxDevWriteProbe (unsigned wordSize, volatile void *ptr, const void *pValue);
 
diff --git a/modules/libcom/src/osi/os/vxWorks/epicsAtomicOSD.h b/modules/libcom/src/osi/os/vxWorks/epicsAtomicOSD.h
index bdf48870a..53f69de9f 100644
--- a/modules/libcom/src/osi/os/vxWorks/epicsAtomicOSD.h
+++ b/modules/libcom/src/osi/os/vxWorks/epicsAtomicOSD.h
@@ -154,11 +154,11 @@ EPICS_ATOMIC_INLINE size_t epicsAtomicSubSizeT ( size_t * pTarget, size_t delta
 
 /*
  * if its 64 bit SMP vxWorks and the compiler doesnt
- * have an intrinsic then maybe there isnt any way to
+ * have an intrinsic then maybe there isn't any way to
  * implement these without using a global lock because
  * size_t is maybe bigger than atomic_t
  *
- * I dont yet have access to vxWorks manuals for
+ * I don't yet have access to vxWorks manuals for
  * 64 bit systems so this is still undecided, but is
  * defaulting now to a global lock
  */
@@ -216,7 +216,7 @@ extern "C" {
 #ifndef EPICS_ATOMIC_READ_MEMORY_BARRIER
 #define EPICS_ATOMIC_READ_MEMORY_BARRIER
 /*
- * no need for memory barrior since prior to vxWorks 6.6 it is a single cpu system
+ * no need for memory barrier since prior to vxWorks 6.6 it is a single cpu system
  * (we are not protecting against multiple access to memory mapped IO)
  */
 EPICS_ATOMIC_INLINE void epicsAtomicReadMemoryBarrier (void) {}
@@ -225,7 +225,7 @@ EPICS_ATOMIC_INLINE void epicsAtomicReadMemoryBarrier (void) {}
 #ifndef EPICS_ATOMIC_WRITE_MEMORY_BARRIER
 #define EPICS_ATOMIC_WRITE_MEMORY_BARRIER
 /*
- * no need for memory barrior since prior to vxWorks 6.6 it is a single cpu system
+ * no need for memory barrier since prior to vxWorks 6.6 it is a single cpu system
  * (we are not protecting against multiple access to memory mapped IO)
  */
 EPICS_ATOMIC_INLINE void epicsAtomicWriteMemoryBarrier (void) {}
diff --git a/modules/libcom/src/osi/os/vxWorks/osdPoolStatus.c b/modules/libcom/src/osi/os/vxWorks/osdPoolStatus.c
index 3b2648d57..8c4618af8 100644
--- a/modules/libcom/src/osi/os/vxWorks/osdPoolStatus.c
+++ b/modules/libcom/src/osi/os/vxWorks/osdPoolStatus.c
@@ -16,8 +16,8 @@
 
 /*
  * It turns out that memPartInfoGet() and memFindMax() are very CPU intensive on vxWorks
- * so we must spawn off a thread that periodically polls. Although this isnt 100% safe, I
- * dont see what else to do.
+ * so we must spawn off a thread that periodically polls. Although this isn't 100% safe, I
+ * don't see what else to do.
  *
  * It takes about 30 uS to call memPartInfoGet() on a pcPentium I vxWorks system.
  *
diff --git a/modules/libcom/src/osi/os/vxWorks/osdSpin.c b/modules/libcom/src/osi/os/vxWorks/osdSpin.c
index 9d1882eec..afbfda455 100644
--- a/modules/libcom/src/osi/os/vxWorks/osdSpin.c
+++ b/modules/libcom/src/osi/os/vxWorks/osdSpin.c
@@ -16,7 +16,7 @@
  *          Andrew Johnson <anj@aps.anl.gov>
  *          Michael Davidsaver <mdavidsaver@bnl.gov>
  *
- * Inspired by Linux UP spinlocks implemention
+ * Inspired by Linux UP spinlocks implementation
  *   include/linux/spinlock_api_up.h
  */
 
diff --git a/modules/libcom/src/osi/os/vxWorks/task_params.h b/modules/libcom/src/osi/os/vxWorks/task_params.h
index a3b1b469a..d57cbdd59 100644
--- a/modules/libcom/src/osi/os/vxWorks/task_params.h
+++ b/modules/libcom/src/osi/os/vxWorks/task_params.h
@@ -55,9 +55,9 @@
 /* Task priorities */
 #define SCANONCE_PRI    129      /* scan one time */
 /*DO NOT RUN ANY RECORD PROCESSING TASKS AT HIGHER PRIORITY THAN _netTask=50*/
-#define CALLBACK_PRI_LOW 140      /* callback task - generall callback task */
-#define CALLBACK_PRI_MEDIUM 135     /* callback task - generall callback task */
-#define CALLBACK_PRI_HIGH 128      /* callback task - generall callback task */
+#define CALLBACK_PRI_LOW 140      /* callback task - general callback task */
+#define CALLBACK_PRI_MEDIUM 135     /* callback task - general callback task */
+#define CALLBACK_PRI_HIGH 128      /* callback task - general callback task */
 #define EVENTSCAN_PRI   129      /* Event Scanner - Runs on a global event */
 #define SMCMD_PRI       120      /* Stepper Motor Command Task - Waits for cmds */
 #define SMRESP_PRI      121      /* Stepper Motor Resp Task - Waits for resps */
diff --git a/modules/libcom/src/osi/os/vxWorks/veclist.c b/modules/libcom/src/osi/os/vxWorks/veclist.c
index 1a4c4ad35..949606936 100644
--- a/modules/libcom/src/osi/os/vxWorks/veclist.c
+++ b/modules/libcom/src/osi/os/vxWorks/veclist.c
@@ -8,7 +8,7 @@
 * in file LICENSE that is included with this distribution.
 \*************************************************************************/
 /*
- *  list fuctions attached to the interrupt vector table
+ *  list functions attached to the interrupt vector table
  *
  *  Created 28Mar89     Jeffrey O. Hill
  *  johill@lanl.gov
diff --git a/modules/libcom/src/osi/osdNetIfAddrs.c b/modules/libcom/src/osi/osdNetIfAddrs.c
index 97be89b36..293d9ef85 100644
--- a/modules/libcom/src/osi/osdNetIfAddrs.c
+++ b/modules/libcom/src/osi/osdNetIfAddrs.c
@@ -70,7 +70,7 @@ LIBCOM_API void epicsStdCall osiSockDiscoverBroadcastAddresses
             ifa->ifa_name));
 
         /*
-         * If its not an internet interface then dont use it
+         * If its not an internet interface then don't use it
          */
         if ( ifa->ifa_addr->sa_family != AF_INET ) {
              ifDepenDebugPrintf ( ("osiSockDiscoverBroadcastAddresses(): interface \"%s\" was not AF_INET\n", ifa->ifa_name) );
@@ -78,7 +78,7 @@ LIBCOM_API void epicsStdCall osiSockDiscoverBroadcastAddresses
         }
 
         /*
-         * if it isnt a wildcarded interface then look for
+         * if it isn't a wildcarded interface then look for
          * an exact match
          */
         if ( pMatchAddr->sa.sa_family != AF_UNSPEC ) {
@@ -95,7 +95,7 @@ LIBCOM_API void epicsStdCall osiSockDiscoverBroadcastAddresses
         }
 
         /*
-         * dont bother with interfaces that have been disabled
+         * don't bother with interfaces that have been disabled
          */
         if ( ! ( ifa->ifa_flags & IFF_UP ) ) {
              ifDepenDebugPrintf ( ("osiSockDiscoverBroadcastAddresses(): net intf \"%s\" was down\n", ifa->ifa_name) );
@@ -103,7 +103,7 @@ LIBCOM_API void epicsStdCall osiSockDiscoverBroadcastAddresses
         }
 
         /*
-         * dont use the loop back interface
+         * don't use the loop back interface
          */
         if ( ifa->ifa_flags & IFF_LOOPBACK ) {
              ifDepenDebugPrintf ( ("osiSockDiscoverBroadcastAddresses(): ignoring loopback interface: \"%s\"\n", ifa->ifa_name) );
@@ -189,7 +189,7 @@ static void osiLocalAddrOnce (void *raw)
         }
 
         /*
-         * dont use the loop back interface
+         * don't use the loop back interface
          */
         if ( ifa->ifa_flags & IFF_LOOPBACK ) {
             ifDepenDebugPrintf ( ("osiLocalAddrOnce(): ignoring loopback interface: %s\n", ifa->ifa_name) );
diff --git a/modules/libcom/src/osi/osdNetIfConf.c b/modules/libcom/src/osi/osdNetIfConf.c
index 47339020f..029ed385e 100644
--- a/modules/libcom/src/osi/osdNetIfConf.c
+++ b/modules/libcom/src/osi/osdNetIfConf.c
@@ -135,7 +135,7 @@ LIBCOM_API void epicsStdCall osiSockDiscoverBroadcastAddresses
             (unsigned)current_ifreqsize));
 
         /*
-         * If its not an internet interface then dont use it
+         * If its not an internet interface then don't use it
          */
         if ( pIfreqList->ifr_addr.sa_family != AF_INET ) {
              ifDepenDebugPrintf ( ("osiSockDiscoverBroadcastAddresses(): interface \"%s\" was not AF_INET\n", pIfreqList->ifr_name) );
@@ -143,7 +143,7 @@ LIBCOM_API void epicsStdCall osiSockDiscoverBroadcastAddresses
         }
 
         /*
-         * if it isnt a wildcarded interface then look for
+         * if it isn't a wildcarded interface then look for
          * an exact match
          */
         if ( pMatchAddr->sa.sa_family != AF_UNSPEC ) {
@@ -167,7 +167,7 @@ LIBCOM_API void epicsStdCall osiSockDiscoverBroadcastAddresses
         ifDepenDebugPrintf ( ("osiSockDiscoverBroadcastAddresses(): net intf \"%s\" flags: %x\n", pIfreqList->ifr_name, pIfreqList->ifr_flags) );
 
         /*
-         * dont bother with interfaces that have been disabled
+         * don't bother with interfaces that have been disabled
          */
         if ( ! ( pIfreqList->ifr_flags & IFF_UP ) ) {
              ifDepenDebugPrintf ( ("osiSockDiscoverBroadcastAddresses(): net intf \"%s\" was down\n", pIfreqList->ifr_name) );
@@ -175,7 +175,7 @@ LIBCOM_API void epicsStdCall osiSockDiscoverBroadcastAddresses
         }
 
         /*
-         * dont use the loop back interface
+         * don't use the loop back interface
          */
         if ( pIfreqList->ifr_flags & IFF_LOOPBACK ) {
              ifDepenDebugPrintf ( ("osiSockDiscoverBroadcastAddresses(): ignoring loopback interface: \"%s\"\n", pIfreqList->ifr_name) );
@@ -318,7 +318,7 @@ static void osiLocalAddrOnce (void *raw)
         }
 
         /*
-         * dont use the loop back interface
+         * don't use the loop back interface
          */
         if ( pIfreqList->ifr_flags & IFF_LOOPBACK ) {
             ifDepenDebugPrintf ( ("osiLocalAddr(): ignoring loopback interface: %s\n", pIfreqList->ifr_name) );
diff --git a/modules/libcom/src/osi/osiNTPTime.c b/modules/libcom/src/osi/osiNTPTime.c
index bd9821e4c..f896d7bf7 100644
--- a/modules/libcom/src/osi/osiNTPTime.c
+++ b/modules/libcom/src/osi/osiNTPTime.c
@@ -194,7 +194,7 @@ static void NTPTimeSync(void *dummy)
         diff = epicsTimeDiffInSeconds(&timeNow, &NTPTimePvt.clockTime);
         if (diff >= 0.0) {
             NTPTimePvt.ticksToSkip = 0;
-        } else { /* dont go back in time */
+        } else { /* don't go back in time */
             NTPTimePvt.ticksToSkip = -diff * osdTickRateGet();
         }
         NTPTimePvt.clockTick = tickNow;
diff --git a/modules/libcom/src/osi/osiPoolStatus.h b/modules/libcom/src/osi/osiPoolStatus.h
index 28dba4f10..1668f54cd 100644
--- a/modules/libcom/src/osi/osiPoolStatus.h
+++ b/modules/libcom/src/osi/osiPoolStatus.h
@@ -30,7 +30,7 @@ extern "C" {
  * space is usually necessary to keep the system running reliably.
  * On vxWorks this returns True if at least 100000 bytes is free.
  *
- * \note This routine is called quite frequently by the IOC so an efficent
+ * \note This routine is called quite frequently by the IOC so an efficient
  * implementation is important.
  *
  * \param contiguousBlockSize Block size to check.
diff --git a/modules/libcom/src/osi/osiSock.c b/modules/libcom/src/osi/osiSock.c
index 03387ec61..e92103aca 100644
--- a/modules/libcom/src/osi/osiSock.c
+++ b/modules/libcom/src/osi/osiSock.c
@@ -161,7 +161,7 @@ unsigned epicsStdCall ipAddrToDottedIP (
     }
 
     /*
-     * inet_ntoa() isnt used because it isnt thread safe
+     * inet_ntoa() isn't used because it isn't thread safe
      * (and the replacements are not standardized)
      */
     status = epicsSnprintf (
diff --git a/modules/libcom/src/osi/osiSock.h b/modules/libcom/src/osi/osiSock.h
index 83021257a..98eb2c140 100644
--- a/modules/libcom/src/osi/osiSock.h
+++ b/modules/libcom/src/osi/osiSock.h
@@ -71,7 +71,7 @@ LIBCOM_API int epicsSocketUnsentCount(SOCKET sock);
  *
  * returns the number of character elements stored in buffer not
  * including the null termination, but always writes at least a
- * null ternminater in the string (if bufSize >= 1)
+ * null terminator in the string (if bufSize >= 1)
  */
 LIBCOM_API unsigned epicsStdCall sockAddrToA (
     const struct sockaddr * paddr, char * pBuf, unsigned bufSize );
@@ -83,7 +83,7 @@ LIBCOM_API unsigned epicsStdCall sockAddrToA (
  *
  * returns the number of character elements stored in buffer not
  * including the null termination, but always writes at least a
- * null ternminater in the string (if bufSize >= 1)
+ * null terminator in the string (if bufSize >= 1)
  */
 LIBCOM_API unsigned epicsStdCall ipAddrToA (
     const struct sockaddr_in * pInetAddr, char * pBuf, unsigned bufSize );
@@ -94,7 +94,7 @@ LIBCOM_API unsigned epicsStdCall ipAddrToA (
  *
  * returns the number of character elements stored in buffer not
  * including the null termination, but always writes at least a
- * null ternminater in the string (if bufSize >= 1)
+ * null terminator in the string (if bufSize >= 1)
  */
 LIBCOM_API unsigned epicsStdCall sockAddrToDottedIP ( 
     const struct sockaddr * paddr, char * pBuf, unsigned bufSize );
@@ -105,7 +105,7 @@ LIBCOM_API unsigned epicsStdCall sockAddrToDottedIP (
  *
  * returns the number of character elements stored in buffer not
  * including the null termination, but always writes at least a
- * null ternminater in the string (if bufSize >= 1)
+ * null terminator in the string (if bufSize >= 1)
  */
 LIBCOM_API unsigned epicsStdCall ipAddrToDottedIP ( 
     const struct sockaddr_in * paddr, char * pBuf, unsigned bufSize );
@@ -179,7 +179,7 @@ LIBCOM_API int epicsStdCall sockAddrAreIdentical
  *  a destination port number, and a match address. When the
  *  routine returns there will be one additional entry
  *  (an osiSockAddrNode) in the list for each network interface found that
- *  is up and isnt a loop back interface (match addr is INADDR_ANY),
+ *  is up and isn't a loop back interface (match addr is INADDR_ANY),
  *  or only the interfaces that match the specified addresses (match addr
  *  is other than INADDR_ANY). If the interface supports broadcasting
  *  then add its broadcast address to the list. If the interface is a
@@ -203,7 +203,7 @@ LIBCOM_API void epicsStdCall osiSockDiscoverBroadcastAddresses
  * repeater would not always allow the loopback address
  * as a local client address so current clients alternate
  * between the address of the first non-loopback interface
- * found and the loopback addresss when subscribing with
+ * found and the loopback address when subscribing with
  * the CA repeater until all CA repeaters have been updated
  * to current code. After all CA repeaters have been restarted
  * this osi interface can be eliminated.
diff --git a/modules/libcom/src/osi/osiWireFormat.h b/modules/libcom/src/osi/osiWireFormat.h
index 49059405c..b268b8e3e 100644
--- a/modules/libcom/src/osi/osiWireFormat.h
+++ b/modules/libcom/src/osi/osiWireFormat.h
@@ -22,7 +22,7 @@
 // With future CA protocols user defined payload composition will be
 // supported and we will need to move away from a naturally aligned
 // protocol (because pad byte overhead will probably be excessive when
-// maintaining 8 byte natural alignment if the user isnt thinking about
+// maintaining 8 byte natural alignment if the user isn't thinking about
 // placing like sized elements together).
 //
 // Nevertheless, the R3.14 protocol continues to be naturally aligned,
@@ -152,7 +152,7 @@ union WireAlias < epicsFloat32 > {
 //
 // Missaligned unsigned wire format get/set can be implemented generically
 // w/o performance penalty. Attempts to improve this on architectures that
-// dont have alignement requirements will probably get into trouble with
+// don't have alignment requirements will probably get into trouble with
 // over-aggressive optimization under strict aliasing rules.
 //
 
diff --git a/modules/libcom/src/timer/timer.cpp b/modules/libcom/src/timer/timer.cpp
index 5953a36f6..458a68e4f 100644
--- a/modules/libcom/src/timer/timer.cpp
+++ b/modules/libcom/src/timer/timer.cpp
@@ -152,7 +152,7 @@ void timer::cancel ()
             this->curState = timer::stateLimbo;
             if ( this->queue.processThread != epicsThreadGetIdSelf() ) {
                 // make certain timer expire() does not run after cancel () returns,
-                // but dont require that lock is applied while calling expire()
+                // but don't require that lock is applied while calling expire()
                 while ( this->queue.cancelPending &&
                         this->queue.pExpireTmr == this ) {
                     epicsGuardRelease < epicsMutex > autoRelease ( locker );
@@ -174,7 +174,7 @@ void timer::cancel ()
 epicsTimer::expireInfo timer::getExpireInfo () const
 {
     // taking a lock here guarantees that users will not
-    // see brief intervals when a timer isnt active because
+    // see brief intervals when a timer isn't active because
     // it is is canceled when start is called
     epicsGuard < epicsMutex > locker ( this->queue.mutex );
     if ( this->curState == statePending || this->curState == stateActive ) {
diff --git a/modules/libcom/src/timer/timerPrivate.h b/modules/libcom/src/timer/timerPrivate.h
index 796f0e609..a1f199def 100644
--- a/modules/libcom/src/timer/timerPrivate.h
+++ b/modules/libcom/src/timer/timerPrivate.h
@@ -48,7 +48,7 @@ protected:
     timerQueue & queue;
 private:
     enum state { statePending = 45, stateActive = 56, stateLimbo = 78 };
-    epicsTime exp; // experation time
+    epicsTime exp; // expiration time
     state curState; // current state
     epicsTimerNotify * pNotify; // callback
     void privateStart ( epicsTimerNotify & notify, const epicsTime & );
diff --git a/modules/libcom/src/timer/timerQueue.cpp b/modules/libcom/src/timer/timerQueue.cpp
index db585dfb9..76632d8fd 100644
--- a/modules/libcom/src/timer/timerQueue.cpp
+++ b/modules/libcom/src/timer/timerQueue.cpp
@@ -62,7 +62,7 @@ void timerQueue ::
         strcpy ( date, "UKN DATE" );
     }
     if ( delay >= exceptMsgMinPeriod ) {
-        // we dont touch the typeid for the timer expiration
+        // we don't touch the typeid for the timer expiration
         // notify interface here because they might have
         // destroyed the timer during its callback
         errlogPrintf (
@@ -97,7 +97,7 @@ double timerQueue::process ( const epicsTime & currentTime )
     }
 
     //
-    // Tag current epired tmr so that we can detect if call back
+    // Tag current expired tmr so that we can detect if call back
     // is in progress when canceling the timer.
     //
     if ( this->timerList.first () ) {
@@ -155,7 +155,7 @@ double timerQueue::process ( const epicsTime & currentTime )
             // 1) if another thread is canceling then cancel() waits for
             // the event below
             // 2) if this thread is canceling in the timer callback then
-            // dont touch timer or notify here because the cancel might
+            // don't touch timer or notify here because the cancel might
             // have occurred because they destroyed the timer in the
             // callback
             this->cancelPending = false;
diff --git a/modules/libcom/src/valgrind/valgrind.h b/modules/libcom/src/valgrind/valgrind.h
index 2f0957c0f..16e250060 100644
--- a/modules/libcom/src/valgrind/valgrind.h
+++ b/modules/libcom/src/valgrind/valgrind.h
@@ -1065,7 +1065,7 @@ typedef
 
 /* Use these to write the name of your wrapper.  NOTE: duplicates
    VG_WRAP_FUNCTION_Z{U,Z} in pub_tool_redir.h.  NOTE also: inserts
-   the default behaviour equivalance class tag "0000" into the name.
+   the default behavior equivalence class tag "0000" into the name.
    See pub_tool_redir.h for details -- normally you don't need to
    think about this, though. */
 
@@ -1142,7 +1142,7 @@ typedef
 
 /* Macros to save and align the stack before making a function
    call and restore it afterwards as gcc may not keep the stack
-   pointer aligned if it doesn't realise calls are being made
+   pointer aligned if it doesn't realize calls are being made
    to other functions. */
 
 #define VALGRIND_ALIGN_STACK               \
@@ -1646,7 +1646,7 @@ typedef
 
 /* Macros to save and align the stack before making a function
    call and restore it afterwards as gcc may not keep the stack
-   pointer aligned if it doesn't realise calls are being made
+   pointer aligned if it doesn't realize calls are being made
    to other functions. */
 
 #define VALGRIND_ALIGN_STACK               \
@@ -1661,8 +1661,8 @@ typedef
 /* NB 9 Sept 07.  There is a nasty kludge here in all these CALL_FN_
    macros.  In order not to trash the stack redzone, we need to drop
    %rsp by 128 before the hidden call, and restore afterwards.  The
-   nastyness is that it is only by luck that the stack still appears
-   to be unwindable during the hidden call - since then the behaviour
+   nastiness is that it is only by luck that the stack still appears
+   to be unwindable during the hidden call - since then the behavior
    of any routine using this macro does not match what the CFI data
    says.  Sigh.
 
@@ -2152,7 +2152,7 @@ typedef
 
 /* Macros to save and align the stack before making a function
    call and restore it afterwards as gcc may not keep the stack
-   pointer aligned if it doesn't realise calls are being made
+   pointer aligned if it doesn't realize calls are being made
    to other functions. */
 
 #define VALGRIND_ALIGN_STACK               \
@@ -2631,7 +2631,7 @@ typedef
 
 /* Macros to save and align the stack before making a function
    call and restore it afterwards as gcc may not keep the stack
-   pointer aligned if it doesn't realise calls are being made
+   pointer aligned if it doesn't realize calls are being made
    to other functions. */
 
 #define VALGRIND_ALIGN_STACK               \
@@ -3187,7 +3187,7 @@ typedef
 
 /* Macros to save and align the stack before making a function
    call and restore it afterwards as gcc may not keep the stack
-   pointer aligned if it doesn't realise calls are being made
+   pointer aligned if it doesn't realize calls are being made
    to other functions. */
 
 #define VALGRIND_ALIGN_STACK               \
@@ -3738,7 +3738,7 @@ typedef
 
 /* Macros to save and align the stack before making a function
    call and restore it afterwards as gcc may not keep the stack
-   pointer aligned if it doesn't realise calls are being made
+   pointer aligned if it doesn't realize calls are being made
    to other functions. */
 
 /* This is a bit tricky.  We store the original stack pointer in r10
@@ -6177,7 +6177,7 @@ typedef
              Other values are not allowed. */
           VG_USERREQ__CHANGE_ERR_DISABLEMENT = 0x1801,
 
-          /* Initialise IR injection */
+          /* Initialize IR injection */
           VG_USERREQ__VEX_INIT_FOR_IRI = 0x1901
    } Vg_ClientRequest;
 
@@ -6290,7 +6290,7 @@ VALGRIND_PRINTF_BACKTRACE(const char *format, ...)
 
 
 /* These requests allow control to move from the simulated CPU to the
-   real CPU, calling an arbitary function.
+   real CPU, calling an arbitrary function.
 
    Note that the current ThreadId is inserted as the first argument.
    So this call:
@@ -6564,7 +6564,7 @@ VALGRIND_PRINTF_BACKTRACE(const char *format, ...)
    If a connection is opened with GDB, the output will be sent
    according to the output mode set for vgdb.
    If no connection is opened, output will go to the log output.
-   Returns 1 if command not recognised, 0 otherwise. */
+   Returns 1 if command not recognized, 0 otherwise. */
 #define VALGRIND_MONITOR_COMMAND(command)                               \
    VALGRIND_DO_CLIENT_REQUEST_EXPR(0, VG_USERREQ__GDB_MONITOR_COMMAND, \
                                    command, 0, 0, 0, 0)
diff --git a/modules/libcom/src/yacc/reader.c b/modules/libcom/src/yacc/reader.c
index ff87bea7e..dc0070e65 100644
--- a/modules/libcom/src/yacc/reader.c
+++ b/modules/libcom/src/yacc/reader.c
@@ -3,7 +3,7 @@
 /*  The line size must be a positive integer.  One hundred was chosen   */
 /*  because few lines in Yacc input grammars exceed 100 characters.     */
 /*  Note that if a line exceeds LINESIZE characters, the line buffer    */
-/*  will be expanded to accomodate it.                                  */
+/*  will be expanded to accommodate it.                                  */
 
 #define LINESIZE 100
 
diff --git a/modules/libcom/src/yajl/yajl_buf.h b/modules/libcom/src/yajl/yajl_buf.h
index f0f6fa02d..40a6fbd57 100644
--- a/modules/libcom/src/yajl/yajl_buf.h
+++ b/modules/libcom/src/yajl/yajl_buf.h
@@ -23,7 +23,7 @@
 /*
  * Implementation/performance notes.  If this were moved to a header
  * only implementation using #define's where possible we might be
- * able to sqeeze a little performance out of the guy by killing function
+ * able to squeeze a little performance out of the guy by killing function
  * call overhead.  YMMV.
  */
 
diff --git a/modules/libcom/src/yajl/yajl_common.h b/modules/libcom/src/yajl/yajl_common.h
index fca8454a8..276009f15 100644
--- a/modules/libcom/src/yajl/yajl_common.h
+++ b/modules/libcom/src/yajl/yajl_common.h
@@ -47,7 +47,7 @@ extern "C" {
  * ***YAJL 2.2.0***
  *   This version adds support for JSON5 parsing and generation.
  *   The upstream YAJL repository is no longer being maintained and the
- *   original author no longer responds to messsages, so while this code
+ *   original author no longer responds to messages, so while this code
  *   has been offered for merging into the upstream it is unlikely that
  *   will ever happen. The version number here is thus an EPICS-specific
  *   construct.
diff --git a/modules/libcom/src/yajl/yajl_gen.h b/modules/libcom/src/yajl/yajl_gen.h
index aba643a5a..45d6d15ee 100644
--- a/modules/libcom/src/yajl/yajl_gen.h
+++ b/modules/libcom/src/yajl/yajl_gen.h
@@ -194,7 +194,7 @@ extern "C" {
     YAJL_API yajl_gen_status yajl_gen_array_close(yajl_gen hand);
 
     /** Access the zero-terminated generator buffer. If incrementally
-     *  outputing JSON, one should call yajl_gen_clear() to clear the
+     *  outputting JSON, one should call yajl_gen_clear() to clear the
      *  buffer. This allows stream generation. */
     YAJL_API yajl_gen_status yajl_gen_get_buf(yajl_gen hand,
                                               const unsigned char ** buf,
@@ -210,7 +210,7 @@ extern "C" {
      *  \param hand The generator handle.
      *  \param sep This string will be inserted to separate the previously
      *             generated output from the following; passing \c NULL means
-     *             *no separation* of entites (beware that generating
+     *             *no separation* of entities (beware that generating
      *             multiple JSON numbers without a separator creates
      *             ambiguous output).
      *
diff --git a/modules/libcom/src/yajl/yajl_lex.c b/modules/libcom/src/yajl/yajl_lex.c
index 8dbff43da..f79291cb6 100644
--- a/modules/libcom/src/yajl/yajl_lex.c
+++ b/modules/libcom/src/yajl/yajl_lex.c
@@ -66,7 +66,7 @@ tokToStr(yajl_tok tok)
  */
 
 struct yajl_lexer_t {
-    /* the overal line and char offset into the data */
+    /* the overall line and char offset into the data */
     size_t lineOff;
     size_t charOff;
 
diff --git a/modules/libcom/src/yajl/yajl_lex.h b/modules/libcom/src/yajl/yajl_lex.h
index 7c2a6b9d8..8363de9a5 100644
--- a/modules/libcom/src/yajl/yajl_lex.h
+++ b/modules/libcom/src/yajl/yajl_lex.h
@@ -66,7 +66,7 @@ void yajl_lex_free(yajl_lexer lexer);
 /**
  * run/continue a lex. "offset" is an input/output parameter.
  * It should be initialized to zero for a
- * new chunk of target text, and upon subsetquent calls with the same
+ * new chunk of target text, and upon subsequent calls with the same
  * target text should passed with the value of the previous invocation.
  *
  * the client may be interested in the value of offset when an error is
diff --git a/modules/libcom/src/yajl/yajl_parse.h b/modules/libcom/src/yajl/yajl_parse.h
index 90367d978..c7240f4e4 100644
--- a/modules/libcom/src/yajl/yajl_parse.h
+++ b/modules/libcom/src/yajl/yajl_parse.h
@@ -39,7 +39,7 @@ extern "C" {
         yajl_status_error
     } yajl_status;
 
-    /** Return a human readable, english, string for an error. */
+    /** Return a human readable, English, string for an error. */
     YAJL_API const char * yajl_status_to_string(yajl_status code);
 
     /** An opaque handle to a parser. */
@@ -151,7 +151,7 @@ extern "C" {
         yajl_allow_trailing_garbage = 0x04,
         /**
          * Allow multiple values to be parsed by a single handle. The entire
-         * text must be valid JSON, and values can be seperated by any kind of
+         * text must be valid JSON, and values can be separated by any kind of
          * whitespace. This flag will change the behavior of the parser, and
          * cause it to continue parsing after a value is parsed, rather than
          * transitioning into a complete state. This option can be useful when
diff --git a/modules/libcom/src/yajl/yajl_parser.c b/modules/libcom/src/yajl/yajl_parser.c
index b134228d2..0627215f5 100644
--- a/modules/libcom/src/yajl/yajl_parser.c
+++ b/modules/libcom/src/yajl/yajl_parser.c
@@ -171,7 +171,7 @@ yajl_render_error_string(yajl_handle hand, const unsigned char * jsonText,
     return str;
 }
 
-/* check for client cancelation */
+/* check for client cancellation */
 #define _CC_CHK(x)                                                \
     if (!(x)) {                                                   \
         yajl_bs_set(hand->stateStack, yajl_state_parse_error);    \
@@ -249,7 +249,7 @@ yajl_do_parse(yajl_handle hand, const unsigned char * jsonText,
             /* for arrays and maps, we advance the state for this
              * depth, then push the state of the next depth.
              * If an error occurs during the parsing of the nesting
-             * enitity, the state at this level will not matter.
+             * entity, the state at this level will not matter.
              * a state that needs pushing will be anything other
              * than state_start */
 
diff --git a/modules/libcom/test/epicsAtomicPerform.cpp b/modules/libcom/test/epicsAtomicPerform.cpp
index 21f11fd4e..a56f70cfb 100644
--- a/modules/libcom/test/epicsAtomicPerform.cpp
+++ b/modules/libcom/test/epicsAtomicPerform.cpp
@@ -236,7 +236,7 @@ private:
 // tests the time it takes to perform a call to an external
 // function and also increment an integer word. The
 // epicsInterruptIsInterruptContext function is an
-// out-of-line function implemented in a sharable library
+// out-of-line function implemented in a shareable library
 // so hopefully it wont be optimized away.
 template < class T >
 inline void OrdinaryIncr < T > :: run ()
@@ -561,7 +561,7 @@ MAIN ( epicsAtomicPerform )
     // The tests running here are measuring fast
     // functions so they tend to be impacted
     // by where the cache lines are wrt to the
-    // virtual pages perhap
+    // virtual pages perhaps
     //
     measure < AtomicSet < int > > ();
     measure < AtomicSet < size_t > > ();
diff --git a/modules/libcom/test/epicsEnvTest.c b/modules/libcom/test/epicsEnvTest.c
index dc3cffdc5..543cec77d 100644
--- a/modules/libcom/test/epicsEnvTest.c
+++ b/modules/libcom/test/epicsEnvTest.c
@@ -18,7 +18,7 @@
  * configured to maintain separate, totally independent sets
  * of environment variables for each thread. This configuration
  * is not supported by EPICS which expects child threads to at
- * least inherit the partent thread's environment variables.
+ * least inherit the parent thread's environment variables.
  */
 
 #include <stdlib.h>
diff --git a/modules/libcom/test/epicsInlineTest1.c b/modules/libcom/test/epicsInlineTest1.c
index 62da1a134..a572d55ff 100644
--- a/modules/libcom/test/epicsInlineTest1.c
+++ b/modules/libcom/test/epicsInlineTest1.c
@@ -6,7 +6,7 @@
 * in file LICENSE that is included with this distribution.
 \*************************************************************************/
 
-/* This test checks the variations on inline function defintions.
+/* This test checks the variations on inline function definitions.
  *
  *  "static inline int func(void) {...}"
  *
diff --git a/modules/libcom/test/epicsMessageQueueTest.cpp b/modules/libcom/test/epicsMessageQueueTest.cpp
index c2e041a75..d245cde89 100644
--- a/modules/libcom/test/epicsMessageQueueTest.cpp
+++ b/modules/libcom/test/epicsMessageQueueTest.cpp
@@ -168,7 +168,7 @@ fastSender(void *arg)
     epicsMessageQueue *q = (epicsMessageQueue *)arg;
     numSent = 0;
 
-    // Send first withough timeout
+    // Send first without timeout
     q->send((void *)msg1, 4);
     numSent++;
 
diff --git a/modules/libcom/test/epicsStdioTest.c b/modules/libcom/test/epicsStdioTest.c
index 6569b5029..be89b4056 100644
--- a/modules/libcom/test/epicsStdioTest.c
+++ b/modules/libcom/test/epicsStdioTest.c
@@ -132,7 +132,7 @@ MAIN(epicsStdioTest)
     testPlan(163);
     testEpicsSnprintf();
 #ifdef __rtems__
-    /* ensure there is a writeable area */
+    /* ensure there is a writable area */
     mkdir( "/tmp", S_IRWXU );
     testStdoutRedir("/tmp/report");
 #else
diff --git a/modules/libcom/test/epicsThreadPerform.cpp b/modules/libcom/test/epicsThreadPerform.cpp
index aad3a9e68..07238cb33 100644
--- a/modules/libcom/test/epicsThreadPerform.cpp
+++ b/modules/libcom/test/epicsThreadPerform.cpp
@@ -73,7 +73,7 @@ static double measureSleepQuantum (
     for ( unsigned i = 0u; i < iterations; i++ ) {
         // try to guarantee a uniform probability density function
         // by intentionally burning some CPU until we are less
-        // likely to be aligned with the schedualing clock
+        // likely to be aligned with the scheduling clock
         double interval = rand ();
         interval /= RAND_MAX;
         interval *= testInterval;
diff --git a/modules/libcom/test/ipAddrToAsciiTest.cpp b/modules/libcom/test/ipAddrToAsciiTest.cpp
index 7e6b9cc00..bbf7383c8 100644
--- a/modules/libcom/test/ipAddrToAsciiTest.cpp
+++ b/modules/libcom/test/ipAddrToAsciiTest.cpp
@@ -155,7 +155,7 @@ MAIN(ipAddrToAsciiTest)
     }
     doCancel();
     // TODO: somehow test cancel of in-progress callback
-    // allow time for any un-canceled transcations to crash us...
+    // allow time for any un-canceled transactions to crash us...
     epicsThreadSleep(1.0);
 
 #ifdef __linux__