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SHUTDOWN(8)		FreeBSD	System Manager's Manual		   SHUTDOWN(8)

     shutdown, poweroff	-- close down the system at a given time

     shutdown [-] [-c |	-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.  In	order to use the shutdown command, the
     user must have root privileges or be a member of the operator group.

     The following options are available:

     -c	     The system	is power cycled	(power turned off and then back	on) at
	     the specified time.  If the hardware doesn't support power	cycle,
	     the system	will be	rebooted.  At the present time,	only systems
	     with BMC supported	by the ipmi(4) driver that implement this
	     functionality support this	flag.  The amount of time the system
	     is	off is dependent on the	device that implements this feature.

     -h	     The system	is halted at the specified time.

     -p	     The system	is halted and the power	is turned off (hardware	sup-
	     port required, otherwise the system is halted) at the specified

     -r	     The system	is rebooted at the specified time.

     -k	     Kick everybody off.  The -k option	does not actually halt the
	     system, but leaves	the system multi-user with logins disabled
	     (for all but super-user).

     -o	     If	one of the -c, -h, -p or -r options are	specified, shutdown
	     will execute halt(8) or reboot(8) instead of sending a signal to

     -n	     If	the -o option is specified, prevent the	file system cache from
	     being flushed by passing -n to halt(8) or reboot(8).  This	option
	     should probably not be used.

     time    Time is the time at which shutdown	will bring the system down and
	     may be the	case-insensitive word now (indicating an immediate
	     shutdown) or a future time	in one of two formats: +number,	or
	     yymmddhhmm, where the year, month,	and day	may be defaulted to
	     the current system	values.	 The first form	brings the system down
	     in	number minutes and the second at the absolute time specified.
	     +number may be specified in units other than minutes by appending
	     the corresponding suffix: "s", "sec", "m",	"min", "h", "hour".

	     If	an absolute time is specified, but not a date, and that	time
	     today has already passed, shutdown	will assume that the same time
	     tomorrow was meant.  (If a	complete date is specified which has
	     already passed, shutdown will print an error and exit without
	     shutting the system down.)

	     Any other arguments comprise the warning message that is broad-
	     cast to users currently logged into the system.

     -	     If	`-' is supplied	as an option, the warning message is read from
	     the standard input.

     At	intervals, becoming more frequent as apocalypse	approaches and start-
     ing at ten	hours before shutdown, warning messages	are displayed on the
     terminals of all users logged in.	Five minutes before shutdown, or imme-
     diately if	shutdown is in less than 5 minutes, logins are disabled	by
     creating /var/run/nologin and copying the warning message there.  If this
     file exists when a	user attempts to log in, login(1) prints its contents
     and exits.	 The file is removed just before shutdown exits.

     At	shutdown time a	message	is written to the system log, containing the
     time of shutdown, the person who initiated	the shutdown and the reason.
     The corresponding signal is then sent to init(8) to respectively halt,
     reboot or bring the system	down to	single-user state (depending on	the
     above options).  The time of the shutdown and the warning message are
     placed in /var/run/nologin	and should be used to inform the users about
     when the system will be back up and why it	is going down (or anything

     A scheduled shutdown can be canceled by killing the shutdown process (a
     SIGTERM should suffice).  The /var/run/nologin file that shutdown created
     will be removed automatically.

     When run without options, the shutdown utility will place the system into
     single user mode at the time specified.

     Calling "poweroff"	is equivalent to running:

	   shutdown -p now

     /var/run/nologin  tells login(1) not to let anyone	log in

     Reboot the	system in 30 minutes and display a warning message on the ter-
     minals of all users currently logged in:

	   # shutdown -r +30 "System will reboot"

     The hours and minutes in the second time format may be separated by a
     colon (``:'') for backward	compatibility.

     kill(1), login(1),	wall(1), nologin(5), halt(8), init(8), reboot(8)

     A shutdown	command	was originally written by Ian Johnstone	for UNSW's
     modified AT&T UNIX	6th Edn.  It was modified and then incorporated	in

FreeBSD	13.0		       November	7, 2022			  FreeBSD 13.0


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