force adding a whenfilechanges function for all

qcd_function

@@ -77,3 +77,30 @@ function qcd() {
      fi
     fi
 }
+
+
+function whenfilechanges() {
+    [ -z "$1" ] && { echo 'Usage: whenfilechanges "file" "some" "command" 
+      Follows the modification time of the "file" and runs the command 
+      at every change.  '
+        return
+    }
+    [ -e "$1" ] || { echo $1 not found
+        return
+    }
+    
+    fname=$1
+    shift 1
+    otime=$( stat -c %Z "$fname" )
+    while : 
+    do ntime=$( stat -c %Z "$fname" )
+        [ "$ntime" -ne "$otime" ] && {
+            eval "$@"
+            otime="$ntime"
+        }
+        
+       sleep 2
+    done
+
+}
+