When I'm finally up and running (and caught up), I'll happily run a script on the entire catalogue if someone can throw together a linux bash script 
(All files will be DEcompressed, so they'll be far easier to work on rather than needing a decompression routine)
(I'm currently moving from Windows & Multiple Hardware RAID5s with NTFS & data deduplication to Linux & ZFS. It's taking far longer than i'd hoped, but i'll get there!)