Simple Revision Control The venerable RCS (Revision Control System) has survived into the era of distributed version control because it fills a niche: sometimes you only *want* to track changes in single files at a time - for example, if you have a directory full of documents with separate histories. SRC (Simple Revision Control) is RCS, reloaded. It remains determinedly file-oriented and doesn't even track the committer of a change (because that's always you), but incorporates the design and user-interface lessons of modern systems. It features sequential revision numbers, lockless operation, embedded command help, and a command set that will seem familiar to users of Subversion, Mercurial, and Git.