Fdupes

Tool to find any duplicate / double / replica of files.

List duplicates

fdupes . -r

List duplicates and ask which ones to delete

fdupes -rd .

List duplicates and ask which ones to delete, searching following symlinks

fdupes -rd --symlinks .

Automatically delete the second of each automatically

fdupes . -rdN 

Automatically delete the second of each automatically, searching following symlinks

fdupes . -rdN --symlinks