Linux only: Want to have your system shut down at bed time, or restart while you're away?
GShutdown, a free Linux utility, lets you tell your system to turn off, restart, or log off at a specified time and date, after a certain delay, or upon a specific action being run. You can tell GShutdown to run a command before doing its thing, and users with older systems can specify the terminal command used to bring everything to a halt. GShutdown is a free download for Linux systems, available in many repositories and pre-packaged at the link below.
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http://gshutdown.tuxfamily.org/en/download.php