Simple anti-theft script for Debian systems. When the machine enters battery mode while in lockscreen/screensaver, kill KeePassX, Chromium, Firefox, dismount TrueCrypt volumes and shut down.

anti-theft

#!/bin/sh
# Put this file in /etc/pm/power.d/ and make it executable

case $1 in
  true)
    # Replace <username> with your actual username.
    # You might need to use gnome-screensaver-command instead
    if DISPLAY=:0.0 XAUTHORITY=/home/<username>/.Xauthority sudo -u <username> cinnamon-screensaver-command -q | egrep -q 'is active'; then
      # Kill KeePassX
      killall keepassx

      # Dismount all TrueCrypt volumes
      truecrypt --dismount

      # Kill all chromium processes
      for i in $(ps ax | grep chromium-browser | cut -d"?" -f1 | grep -v chromium-browser); do kill -9 $i ; done

      # Kill all Firefox processes
      for i in $(ps ax | grep firefox | cut -d"?" -f1 | grep -v firefox); do kill -9 $i ; done

      # Shut down the machine
      shutdown -P now
    else
      # Do stuff for when computer enters battery mode in non-lockscreen
    fi
  ;;
  false)
    # Do stuff for when computer enters AC mode
  ;;
  help) help;;
  *) exit $NA ;;
esac

exit 0