use of comm and sort tools

[Linux for blind general discussion]

Tim's suggestion may be best, since mine made the assumption that you 
are in the current directory where your mp3 and m4a files are, and it 
also made the assumption that you have all the m4a files you are 
supposed to have, but are missing some of the mp3 files. Of course you 
can reverse things to look for missing m4a files, and you can put */ in 
front of the file if your directory structure is different. My main goal 
was to try to eliminate any temporary files and just print the m4a files 
that don't have matching mp3.

~Kyle