For another fun misfeature, I have taken to using the -n option with gzip all the time recently. It turns out that gzip has started writing a timestamp into the compressed output. This means you can compress two files with identical content and get different .gz files :-( Caused a lot of trouble for my hard-link tree backup setups.
Actually, gzip has done that for the last decade or so. And, yes, I've been annoyed by it as well, for the last decade or so. --wpd
