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John the Ripper
There's a few quirks with JTR between OSes.
So, I'm going to write assuming you're working on Windows. :P
If you type "john <password file> -show", you can see your cracked hashes.
In the case it does something, but not cracking (ie: "No password hashes loaded"), then you've either formatted the hash incorrectly (Some take a username:hash type formatting) or you have entered an unsupported hash.