Directory compare script

[Berserker]

Does anyone know of a Linux script/utility/whatever to compare all the files in two directory structures and list what's different. When I was working with *nix at work, I had one, but I've long since lost that.

Suggestions gratefully recieved.

 

[Berserker]

Oooh, and welcome back Mpemba Effect! I havent seen you around in ages!

Yup. Indeed. Nice to see you around again.

PS. Add --recursive to the above and we're on to a winner. Didn't know diff could do this.