-r Requests that the system be rebooted after it has been brought down.
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-h Requests that the system be either halted or powered off after it has been brought down, with the
choice as to which left up to the system.
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-H Requests that the system be halted after it has been brought down.
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-P Requests that the system be powered off after it has been brought down.
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-c Cancels a running shutdown. TIME is not specified with this option, the first argument is
MESSAGE.
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-k Only send out the warning messages and disable logins, do not actually bring the system down.
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