UNIX / Linux shutdown Commands

Shutdown the machine immediately
# shutdown -h now

Reboot the machine immediately
# shutdown -r now

Shutdown the machine with user defined message
# shutdown -h now 'System is going down for upgrade'

Scheduling the shutdown with 24 hour format
# shutdown -h 20:00


Cancel a running shutdown
You can cancel the running shutdown by using -c option as,
# shutdown -c

-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

See log of system shutdown
# last reboot
reboot   system boot  2.6.18-238.12.1. Sun Jun  5 07:56         (17+00:07)
reboot   system boot  2.6.18-238.9.1.e Sat Apr 30 05:08         (36+02:44)
reboot   system boot  2.6.18-238.9.1.e Fri Apr 22 02:38         (8+02:25)
reboot   system boot  2.6.18-238.5.1.e Sat Mar  5 19:13         (47+06:21)
reboot   system boot  2.6.18-238.1.1.e Sat Jan 22 06:44         (42+12:25) 


Solaris 

You need to use the shutdown command as follows (you must login as root)
# shutdown -y -g0 -i S 
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