Improve argument check

showtags

@@ -1,45 +1,60 @@
 #!  /bin/bash
 #
-asciiMonth=0
-while [ $# != 0 ]; do
-  case "$1" in
-    -h | -\? | --help)
-        echo "usage: showtags [-a] [-s]"
+#  $Source: /cvs/G/EPICS/App/scripts/showtags,v $
+#  $Revision: 1.11 $   $Date: 2006/12/08 08:09:18 $
+#----------------------------------------------------
+#         Check the command line
+#
+  opts=$(getopt -n showtags ahvs $*)
+  if [ $? != 0 ]; then echo Try: -h; exit; fi
+#
+#         Command line is OK, so set the args and continue.
+#
+  set -- $opts
+
+  asciiMonth=0
+
+  while [ $# != 0 ]; do
+    case "$1" in
+      -h | -\? | --help)
+        echo "usage: showtags [-a] [-s] [-h] [-v]"
         echo " Find CVS tags in this directory and subdirectories."
         echo " If there is a connection to psip0 (Oracle 9) you get date and time info too."
         echo " Specify -a to get months displayed as abbreviated text string."
         echo " Specify -s to get the tagged status of files in the directory."
         exit 0
         ;;
-    -v | --version)
+      -v | --version)
         echo 'Original Author: Dirk Zimoch'
         echo 'Last Change by $Author: maden $'
-        echo '$Revision: 1.10 $   $Date: 2006/12/08 07:37:31 $'
+        echo '$Revision: 1.11 $   $Date: 2006/12/08 08:09:18 $'
         echo '$Source: /cvs/G/EPICS/App/scripts/showtags,v $'
         exit 0
         ;;
-    -a)
+      -a)
         # Display months as abbreviated month strings, not as numbers.
         asciiMonth=1
         ;;
-    -s)
+      -s)
         # Show the tagged status of the directory.
         tagStatus
         exit $?
         ;;
-    -*)
-        echo "Unknown option $1. Try: -h, --help, -v, --version, -a"
+      --)
+        ;;
+      *)
+        echo "Invalid argument $1. Try: -h"
         exit 1
         ;;
-  esac
-  shift
-done
-trap "stty echo" EXIT SIGTERM SIGKILL
+    esac
+    shift
+  done
+  trap "stty echo" EXIT SIGTERM SIGKILL
 
-TAGS=$(cvs status -v 2>/dev/null | awk '
-/\(revision:/   {tag[$1]=1}
-END             {for (i in tag) { print i}}
-')
+  TAGS=$(cvs status -v 2>/dev/null | awk '
+    /\(revision:/   {tag[$1]=1}
+    END             {for (i in tag) { print i}}
+    ')
 
 function jointags()
 {