(via www.susegeek.com)
fdupes is a simple Command Line utility to find and list duplicate files in the specified directories. fdupes can also delete the found duplicate files if instructed. fdupes can follow Symlinks and can be instructed to ignore hardlinks. fdupes can also show the size of the duplicate files. fdupes is a simple and very efficient tool, easy to use.
Comments
Well as for me i use a special sotware to delete duplicates. My favourite tool for these porpuses is Clone Remover. Besides it's the best photo duplicate remover o know (read about this here - http://www.fileutilityblog.com