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Chapter 8 . Understanding the Boot Process 307 Table 8-6 shutdown Options Option Function -t Tells init to wait the specified number of seconds before sending the warning and kill commands to processes. -k Does not actually shut down the system, but only sends the warning. -r Reboots the system after shutdown. -h Halts the system after shutdown. -f Skips the fsck check on reboot. -F Forces a fsck check on reboot. -c Cancels a shutdown. The time to shut the system down. This can be given in HH:MM format, +N for the number of minutes from now to execute, or the keyword now which means +0. The warning message to send to all users. -a Uses /etc/shutdown.allow, which lets nonroot users shut down the system. The halt, reboot, and poweroff commands are used to stop, restart, or power off the system. The syntaxes for these commands are as follows: /sbin/halt [-n] [-w] [-d] [-f] [-i] [-p] /sbin/reboot [-n] [-w] [-d] [-f] [-i] /sbin/poweroff [-n] [-w] [-d] [-f] [-i] Table 8-7 lists the supported command-line options. The reboot and poweroff commands are actually symbolic links to halt. The functionality depends on the link called. If the system is not in runlevel 0 or 6 before these commands are called, the shutdown command will be used instead.
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