FreeBSD Handbook
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# 13.7 Shutdown Sequence

Upon controlled shutdown using shutdown(8), init(8) will attempt to run the script `/etc/rc.shutdown`, and then proceed to send all processes the `TERM` signal, and subsequently the `KILL` signal to any that do not terminate in a timely manner.

To power down a FreeBSD machine on architectures and systems that support power management, use `shutdown -p now` to turn the power off immediately. To reboot a FreeBSD system, use `shutdown -r now`. One must be `root` or a member of the `operator` group in order to run shutdown(8). One can also use halt(8) and reboot(8). Refer to their manual pages and to shutdown(8) for more information.

> Note: Power management requires acpi(4) to be loaded as a module or staticly compiled into a custom kernel.

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