What is this code "lemming's" had posted? Could you give a link?

Alternately, just search perlmonks for code the searches duplicate files, there's bound to be plenty of it. Hmm, actually I did the search and there's not that many of them posted. Still, there are lots on the internet outside of the monastery too.

• Find duplicate files. (though you'll have to modify it to actually list the paths),
• Recursive search for duplicate files (searches for files with the same name)\
• Replace duplicate files with hardlinks
• Removing Duplicate Files
• Just find -exec md5sum -- {} + | sort | uniq -D

(Some of the above might be duplicates.)