allow glob pattern in var command

Conflicts:
	documentation/RELEASE_NOTES.md

documentation/RELEASE_NOTES.md

@@ -17,6 +17,11 @@ should also be read to understand what has changed since earlier releases.
 
 <!-- Insert new items immediately below here ... -->
 
+### Glob pattern allowed in `var` command
+
+When used with one argument, the `var` command can be used with a glob pattern
+for printing matching variables.
+
 ### Fix for input links marked "special"
 
 The calcout record (and a number of synApps record types) marks its input

modules/libcom/src/iocsh/iocsh.cpp

@@ -1130,6 +1130,16 @@ static void varCallFunc(const iocshArgBuf *args)
         for (v = iocshVariableHead ; v != NULL ; v = v->next)
             varHandler(v->pVarDef, args[1].sval);
     }
+    else if(args[1].sval == NULL) {
+        int found = 0;
+        for (v = iocshVariableHead ; v != NULL ; v = v->next)
+            if (epicsStrGlobMatch(v->pVarDef->name, args[0].sval) != 0) {
+                varHandler(v->pVarDef, NULL);
+                found = 1;
+            }
+        if (!found)
+            fprintf(epicsGetStderr(), "No var matching %s found.\n", args[0].sval);
+    }
     else {
         v = (iocshVariable *)registryFind(iocshVarID, args[0].sval);
         if (v == NULL) {