The tip that I've been using quite a lot lately by debugging long log files is using `&` to filter what I want to read and `&!` to filter-out what's not useful (and they support regexes).

Admittedly, they are a bit slow sometime and sure, you could use `grep -v` then pipe which is way faster, but they've saved me on removing noise from logfiles from time to time when you don't always know what to filter beforehand :).

EDIT: It was in TFA.