Q. How do I shutdown / poweroff a UNIX computer system from a shell prompt?
A. The halt and poweroff UNIX command line utilities write any pending information to the disks and then stop the processor. The poweroff utility has the machine remove power, if possible. So to shutdown UNIX computer type the following as root user:
halt
or
poweroff
In the following example, shutdown is being executed and is scheduled in 120 seconds. The warning message is output 2 minutes:
shutdown -y -i 5 -g 120 "===== disk replacement ====="
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{ 1 comment… read it below or add one }
it will msg that “shutdown command not found”