Fix to assure only one instance is running.

Since this script runs under /usr/bin/env, running 'pgrep $0' will fail
due to it being a child of 'bash'. In order to fix this, pgrep must use
the `-o` flag (oldest pid, or in this case, the leader), and `-f` which
searches the full process name.

rsync_tmbackup.sh

@@ -307,7 +307,7 @@ if [ -n "$(fn_find "$INPROGRESS_FILE")" ]; then
 		fi
 	else
 		RUNNINGPID="$(fn_run_cmd "cat $INPROGRESS_FILE")"
-		if [ "$RUNNINGPID" = "$(pgrep "$APPNAME")" ]; then
+		if [ "$RUNNINGPID" = "$(pgrep -o -f "$APPNAME")" ]; then
 			fn_log_error "Previous backup task is still active - aborting."
 			exit 1
 		fi