+$helptext = <<<END_OF_TWITTER_HELP
+Batch script for synching local friends with Twitter friends.
+
+END_OF_TWITTER_HELP;
+
+require_once INSTALLDIR.'/scripts/commandline.inc';
+
+// Make a lockfile
+$lockfilename = lockFilename();
+if (!($lockfile = @fopen($lockfilename, "w"))) {
+ print "Already running... exiting.\n";
+ exit(1);
+}
+
+// Obtain an exlcusive lock on file (will fail if script is already going)
+if (!@flock( $lockfile, LOCK_EX | LOCK_NB, &$wouldblock) || $wouldblock) {
+ // Script already running - abort
+ @fclose($lockfile);
+ print "Already running... exiting.\n";
+ exit(1);
+}