SFV Check script
Here's a handy little script for checking Simple File Verification (SFV) files. These are commonly used when distributing files over Usenet, where a large file is sliced into many parts and posted separately. It is just a list of checksums of the smaller parts of the file, so doesn't guard against evil-doers, just random errors.
I used to use a GUI program on the Mac, but it started misbehaving and I'm much happier at the command line.