Check for duplicated files

How many duplicated files have you got?
Have you ever wondered if you have backed-up or copied a file to somewhere?
Have you ever wondered if and how many versions of the same file you have stored on your pc?

You don’t have to wonder anymore!

A student of mine was asking if I knew a way to find all the duplicated files stored on his computer.
I didn’t, but goggled for it, and yes, I did find a very useful small program dupeGuru (hardcoded.net);
which is a tool to find duplicate files on your computer. It can scan either filenames or contents.