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

NAME
     shutdown -- close down the	system at a given time

SYNOPSIS
     shutdown [-] [-dfhknpr] time [warning-message ...]

DESCRIPTION
     shutdown provides an automated shutdown procedure for superusers 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.  When the shutdown command is issued without options
     the system	is placed in single user mode at the indicated time after
     shutting down all system services.

     The options are as	follows:

     -d	     When used with -h,	-p, or -r causes system	to perform a dump.
	     This option is useful for debugging system	dump procedures	or
	     capturing the state of a corrupted	or misbehaving system.	See
	     savecore(8) for information on how	to recover this	dump.

     -f	     Create the	file /fastboot so that the file	systems	will not be
	     checked by	fsck(8)	during the next	boot.  (See rc(8)).

     -h	     The system	is halted at the specified time	when shutdown execs
	     halt(8).

     -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 superuser).

     -n	     When used with -h,	-p, or -r prevents the normal sync(2) before
	     stopping the system.

     -p	     The system	is powered down	at the specified time.	The -p flag is
	     passed on to halt(8), causing machines which support automatic
	     power down	to do so after halting.

     -r	     shutdown execs reboot(8) at the specified time.

     time    time is the time at which shutdown	will bring the system down and
	     may be the	word now (indicating an	immediate shutdown) or specify
	     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.

     warning-message
	     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 /etc/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 in the system log, containing the
     time of shutdown, who initiated the shutdown and the reason.  A terminate
     signal is then sent to init to bring the system down to single-user state
     (depending	on above options).  The	time of	the shutdown and the warning
     message are placed	in /etc/nologin	and should be used to inform the users
     about when	the system will	be back	up and why it is going down (or	any-
     thing else).

     You can cancel a scheduled	shutdown with the kill(1) command by killing
     the shutdown process.

FILES
     /etc/nologin      tells login not to let anyone log in
     /etc/rc.shutdown  run by rc(8) before the system is shutdown
     /fastboot	       tells rc(8) not to run fsck(8) during the next boot

SEE ALSO
     kill(1), login(1),	wall(1), halt(8), rc.shutdown(8), reboot(8)

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

HISTORY
     The shutdown command appeared in 4.0BSD.

BSD			       January 21, 2015				   BSD

NAME | SYNOPSIS | DESCRIPTION | FILES | SEE ALSO | STANDARDS | HISTORY

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