[Novalug] Diff for directories?

[rarob at comcast.net]

 -------------- Original message ----------------------
From: Nick Danger <nick at hackermonkey.com>
> I have two external HDs. Both are holding a large (60gig+) collection of 
> music files. Somehow I got them out of sync, and each side has a few 
> zero byte files. They differ from drive to drive so I cant just do a 
> bulk copy from one to the other. Is there a diff command for 
> directories? So I can find which files are zero on one side but not on 
> the other? Short of writing some shell/perl, I can't think of anything 
> really easy one command line type.
> 
> Nick
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diff -r --brief $DIR1 $DIR2 

This will show you which files are different, either by the contents being different
or by a file showing up in one directory or the other.  If *both* files are zero, then
this will not show them, but then you have a different (no pun intended) problem.

Rob