If you’re already in Terminal, there’s no need to reach for the mouse to shut down via the Deskbar. Just issue the command shutdown with one of the following flags:
shutdown -r (restart after shutdown)
shutdown -q (shutdown now without asking if open docs should be saved)
shutdown -d xx (where xx is the number of seconds to wait before initating shutdown — this lets you time the shutdown, e.g. to shut down in five minutes, use shutdown -d 300).