comparing folder contents

[Roger Searle]

Hi, I am looking for list recommendations on packages or methods for 
recursively comparing the contents of a couple of folders, and listing 
just the names of files and folders that are absent in one or the 
other.  The purpose of this is as part of testing my backup routine, 
where I restore the tar file somewhere, and want to see which files are 
not in the restore. 

A command line option would probably be fine depending on level of 
complexity.  I thought diff might have been just the thing, but it 
examines the file content, which isn't what I'm interested in.  There 
are a few recommendations for mc, however I'm not a fan (sorry Nick). 

Cheers,
Roger