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source : http://linux.101hacks.com/unix/shutdown/
Shutdown the machine immediately
# shutdown -h now Broadcast message from sathiya@sathiya-laptop (/dev/pts/1) at 11:28 ... The system is going down for halt NOW!
Reboot the machine immediately
# shutdown -r now Broadcast message from sathiya@sathiya-laptop (/dev/pts/1) at 11:28 ... The system is going down for reboot NOW!
Shutdown the machine with user defined message
# shutdown -h now 'System is going down for replacement of primary memory'
Broadcast message from sathiya@sathiya-laptop (/dev/pts/1) at 11:28 ... The system is going down for halt NOW! System is going down for replacement of primary memory
Scheduling the shutdown with 24 hour format
# shutdown -h 20:00
It sends the following message immediately to all terminals.
Broadcast message from sathiya@sathiya-laptop (/dev/pts/3) at 10:25 ... The system is going down for halt in 575 minutes!
Similar to shutdown (halt), you also schedule a reboot at a specified time as shown below.
# shutdown -r 20:00 Broadcast message from sathiya@sathiya-laptop (/dev/pts/3) at 10:27 ... The system is going down for reboot in 573 minutes!
Cancel a running shutdown
You can cancel the running shutdown by using -c option as,
# shutdown -c
Syntax and Options
shutdown [OPTION]… TIME [MESSAGE]
| Short Option | Option Description |
|---|---|
| -r | Requests that the system be rebooted after it has been brought down |
| -h | Requests that the system be either halted or powered off after it has been broughtdown, with the choice as to which left up to the system |
| -H | Requests that the system be halted after it has been brought down |
| -P | Requests that the system be powered off after it has been brought down |
| -c | Cancels a running shutdown. TIME is not specified with this option, the firstargument is MESSAGE |
| -k | Only send out the warning messages and disable logins, do not actually bring thesystem down |