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One of the finest Perl (core!) module I’ve been using lately is File::Find. With File::Find it’s possible to traverse through a directory recursively to find anything you want from it. It comes with a number of options to alter the search behavior and a custom callback has to be supplied to determine what to do with the found file. Such as adding it to a list if it meets certain criteria, computing MD5 checksums or whatever else floats your boat.

Here’s a small example I also posted some time ago on Stack Overflow.