I was screwing around in terminal and wanted to see about turning my computer off before I went to bed, I typed in shutdown as a guess and to my surprise it was actually a command. It then asked for a time (in minutes as I found out) and for root user (so I used sudo) so the final command I sent was sudo shutdown 1, which then sent out a message saying there was one minute until the server would go down for maintenance. So it looked as though things were shutting down as they would in a normal situation, except that the power button on the front of my computer was still glowing green and the monitor did not have the idling orange glow on the power button it normally has when the computer is off. Is this because shutdown is an alternative command to something that turns everything off? Furthermore are there other alternative commands for things such as restarting and shutting down that I can use and have them enact instantaneously?