shutdown ubuntu linux

How do I use shutdown command?

The shutdown command can be used to turn off or reboot a computer. Type the command as follows to shutdown server / computer immediately:

$ sudo shutdown -h now

OR

$ sudo shutdown -h 0

How do I shutdown compute at specific time?

To shutdown computer at 6:45pm, enter:

$ sudo shutdown -h 18:45 "Server is going down for maintenance"

At 6:30pm message will go out to all user and 6:45 system will shutdown.

Please note that you can also use halt or poweroff or reboot command for stopping and restarting the system:
$

sudo halt

OR
$

 sudo poweroff

How do I reboot computer?

Simply use reboot command:
$

sudo reboot

OR
$

 sudo shutdown -r 0

source: http://www.cyberciti.biz/faq/shutdown-ubuntu-linux-computer/

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