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shutdown command

Shutdown UNIX Command

How do I shutdown or poweroff a UNIX computer system from a shell prompt?
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Q. I'd like to monitor my UNIX / Linux server reboot / shutdown usage. How do I get more information about reboot and shutdown command?

A. There is a file called /var/log/wtmp. The pseudo user reboot logs in each time the system is rebooted. Thus last reboot will show a log of all reboots since the log file was created.

wtmp also contains information about reboots and shutdowns, you can list that information, by typing the following command at the shell prompt:
$ sudo last reboot
OR
# last reboot
Output:

reboot   system boot  2.6.22-14-generi Wed Oct 24 08:03 - 08:48  (00:44)
reboot   system boot  2.6.22-14-generi Tue Oct 23 21:21 - 00:40  (03:18)
reboot   system boot  2.6.22-14-generi Tue Oct 23 14:29 - 19:55  (05:26)
reboot   system boot  2.6.22-14-generi Mon Oct 22 18:36 - 19:55 (1+01:19)
reboot   system boot  2.6.22-14-generi Mon Oct 22 17:05 - 19:55 (1+02:50)
reboot   system boot  2.6.22-14-generi Mon Oct 22 14:50 - 17:03  (02:13)
reboot   system boot  2.6.22-14-generi Mon Oct 22 13:28 - 13:29  (00:01)
reboot   system boot  2.6.22-14-generi Mon Oct 22 13:07 - 13:27  (00:20)
reboot   system boot  2.6.22-14-generi Sun Oct 21 14:38 - 08:20  (17:42)
reboot   system boot  2.6.22-14-generi Sat Oct 20 10:53 - 12:54 (1+02:00)
reboot   system boot  2.6.22-14-generi Fri Oct 19 21:18 - 01:41  (04:22)
reboot   system boot  2.6.22-14-generi Fri Oct 19 16:07 - 01:41  (09:34)
reboot   system boot  2.6.22-14-generi Thu Oct 18 22:56 - 12:32  (13:35)
reboot   system boot  2.6.22-14-generi Thu Oct 18 14:30 - 12:32  (22:01)

You can also type the following command to get halt / shutdown time only:
$ last -x | grep down
Output:

vivek    tty1                          Mon Oct 22 13:25 - down   (00:01)
vivek    tty7         :0               Mon Oct 22 13:08 - down   (00:19)
vivek    tty1                          Thu Oct 18 14:25 - down   (00:04)
vivek    tty7         :0               Thu Oct 18 14:24 - down   (00:04)
vivek    tty1                          Thu Oct 18 14:16 - down   (00:00)
vivek    tty1                          Thu Oct 18 14:13 - down   (00:02)

How to use shutdown command under Ubuntu Linux

Q. I've just installed Ubuntu Linux on my computer. I'd like to know - how to shutdown Ubuntu box over ssh session?

A. If you are not using GUI, you can run halt or shutdown command to powerdown box.

shutdown command

shutdown arranges for the system to be brought down in a safe way. All logged-in users are notified that the system is going down and, within the last five minutes of TIME, new logins are prevented. The shutdown utility provides an automated shutdown procedure for supersers to nicely notify users when the system is shutting down, saving them from system administrators, hackers, and gurus, who would otherwise not bother with such niceties.

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

I want to force fsck on the next reboot? How do I force fsck on a Linux based server or laptop? Is there any configuration file that I need to alter for this purpose on a Linux?
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Reboot a Solaris UNIX System

How do I reboot a Solaris UNIX machine or server using the command / shell prompt?
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