deep

deep: "A powerful and extensible Perl script which recursively traverses subdirectories, processing files that match a given filename pattern. There are different commands, which are summarized below. The script is free; anyone may use it with no restrictions."

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I've been mentioned in the Changelog!
I was pretty happy to be able to make deep work on my Windows machine and sent my method to Neil Gunton who made it look nicer and added it to the script. [SLW]