rdfind - Linux file duplicate finder

I have searched off and on for years for a good duplicate file finder/cleanup tool for linux. Doesn't look like it would be that obscure need, but there aren't that many out there, at least that I found.

fdupes is the one I have seen referred to most often, and it does work fine, but never quite what I wanted.

I recently found rdfind. I don't know where its been hiding, but check this tool out!

rdfind using a nice ranking algorithm to decide which file to keep (details on the web page), but the core for me is that if you are searching multiple directories, the "first" directory in the list will wind up considered the "original" and others are what will be deleted. This works so well for my needs.