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 operator 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.

Modify group membership by referring to Section 3.3, “Users and Basic Account Management”.