finding duplicates?

Páxina inicial
Anexos:
Mensaxe orixinal
+ (text/plain)
Borrar esta mensaxe
Responder a esta mensaxe
Autor: Mike
Data:  
Asunto: finding duplicates?
I am looking for a command I can run on the command line (from cron)
which finds/searches (recursively) for duplicate files.

Can anyone give me a hand?