retweet.php <app config file> <session file> <watermark file> <user from> <keyword> [<keyword> ...] [--dry-run] app config file is a 2 line file with Consumer Key and Consumer Secret session file is a 2 line file with oauth token and oauth token secret (authorisation left as an excercise for the reader) watermark file is a 1 line file with the ID of a tweet. It is updated by the bot on each run.