If space is the main concern, I just sort files by size and lop off the videos, old application installers, iso's (!) etc. cd {whatever} du -ah | sort -n "-)

If space is the main concern, I just sort files by size and lop off the videos, old application installers, iso's (!) etc. cd {whatever} du -ah | sort -n "-) It will show dupes, since they are the same size.