/usr/sbin/shutdown [ -y ] [ -g grace-period ] [ -i init-state ] [ message ]

Where

-y = Pre-answer the confirmation question

-g = Amount of time in seconds until shutdown

-i = Run-level to go to. -i0 to shutdown. -i6 to reboot

i.e shutdown -y -g0 -i0 will shutdown the server immediately
 

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