utility to compare 2 dir trees

[Robert Bonomi]

> From owner-freebsd-questions at freebsd.org  Mon Dec 31 19:26:37 2012
> Date: Mon, 31 Dec 2012 20:23:33 -0500
> From: Fbsd8 <fbsd8 at a1poweruser.com>
> To: FreeBSD Questions <freebsd-questions at freebsd.org>
> Subject: utility to compare  2 dir trees
>
> I want to compare 2 different directory trees to each other to locate 
> any differences in directories and files contained there in.
>
> Any suggestions?

'man diff'