Sometimes you just need to reboot or shut down right away-and we mean right away, with no waiting. Thankfully, If you need to reboot and you don’t feel like shutting down your apps one by one or waiting for Mac OS to walk you through them, press Ctrl+Cmd+Eject to reboot your Mac immediately, with no alerts or warning dialogs. If you need to shut down and run out the door, press Ctrl+Opt+Cmd+Eject to shut down immediately, also without alerts or warning dialogs. Be careful using these commands though: you won’t be prompted to save your work or review your open apps first.
You can also press Ctrl+Eject (or press the power button) to bring up the power management menu and select whether you want to reboot, shut down, sleep, or do nothing. Before you use any of these commands though, remember you can always press Cmd+Opt+Shift+Esc to force-quit the front-most application if that’s what’s making you want to reboot — via Lifehacker