I am attempting to send an email on system shutdown and start up. Right now I have a cron entry that utilizes the @reboot option. This fulfills one of my needs - getting the email on start up. How would I go about getting the system to send out an email at the other end of the process? Namely, I want an email as the system is shutting down. Theoretically, this means I should receive two emails every time the system starts (once because I shut it down or rebooted it, and once because it came back up).