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Rename *nix Filenames

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I am a bit slow sometimes and it took me a while to find this unix command that most are probably already aware of. rename is a very useful tool. The example I have here will susbtitute "foo" for "bar" of any file with foo in the name. The really nice thing about this is that it can use and regular expression syntax (ie. "^", "$", etc..).

rename -n 's/foo/bar/' *foo*