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grep is a great little command and probably the first “advanced” command most people learn when first exposed to shell scripting. But what do you do when you need to regularly search a LARGE file system that takes a normal grep command minutes (hours?) to traverse? Even worse, what if that file system has user data mixed in with developer code as well as svn repositories, archive folders and all sorts of other nonsense that returns loads of false positives for even the most targeted, code specific grep you can do?