Find and manage multiple copies of the same file/directory

Question

Due to my father's file mismanagement over the years, he has multiple copies of same files - worth hundreds of megabytes - copied into different directories resulting in a few GBs of HDD occupied needlessly. Is there a software I can use to locate same directory and/or file and help in sorting them out?

In short, I need something that:

• finds copies of the same file and folders
• informs me of files/folders that have the same name even if their contents are not

Solutions not specific to a particular platform preferred, but not an important issue.

Answer 1

sudo apt-get install fdupes
fdupes -r /directory > ~/dupes.txt

This will look for duplicate files (by calculating and comparing their md5 hash values) recursively in /directory and write them to a file named dupes.txt in the user's home directory.

Answer 2

You might want to try fslint if you need a GUI.

sudo apt-get install fslint
fslint