An incredibly thorough guide to online anonymity (and/or privacy) from laptop and phone handling through encryption to password and identity management.

Extensive hardening guide from kernel, firewalls, swap, to userspace and more, covering pretty much all eventualities

Most flexible solution to the problem should be some variation of:

find $DIRECTORY -type f -print0 | xargs -0 stat --format '%Y :%y %n' | sort -nr | cut -d: -f2- | head