shutdown -p now
|SHUTDOWN(8) FreeBSD System Manager’s Manual SHUTDOWN(8)
shutdown — close down the system at a given time
shutdown [-] [-h | -p | -r | -k] [-o [-n]] time [warning-message …]
The shutdown utility provides an automated shutdown procedure for super-
users to nicely notify users when the system is shutting down, saving
them from system administrators, hackers, and gurus, who would otherwise
not bother with such niceties.
The following options are available:
-h The system is halted at the specified time.
-p The system is halted and the power is turned off (hardware sup-port required) at the specified time.
-r The system is rebooted at the specified time.