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NetBSD 6.1.5 - man page for shutdown (netbsd section 8)

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

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

SYNOPSIS
     shutdown [-Ddfhknprvxz] [-b bootstr] time [message ... | -]

DESCRIPTION
     shutdown 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.

     Available friendlinesses:

     -b bootstr
	      The given bootstr is passed to reboot(8) for the benefit of those systems that can
	      pass boot arguments to the firmware.  Currently, this only affects sun3 and sparc
	      machines.

     -d       shutdown will pass the -d flag to reboot(8) or halt(8) to request a kernel core
	      dump.  If neither the -h or -r flags are specified, then -d also implies -r.

     -f       shutdown arranges, in the manner of fastboot(8), for the file systems not to be
	      checked on reboot.

     -h       The system is halted at the specified time, using 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 super-user).

     -n       Prevent the normal sync(2) before stopping.

     -p       The system is powered down at the specified time, using poweroff(8).  If the power-
	      down fails, or the system does not support software powerdown, the system will sim-
	      ply halt instead.

     -r       The system is rebooted at the specified time, using reboot(8).

     -v       To enable verbose messages on the console, pass -v to reboot(8) or halt(8).

     -x       To enable debugging messages on the console, pass -x to reboot(8) or halt(8).

     -z       To silence some shutdown messages on the console, pass -z to reboot(8) or halt(8).

     -D       Prevents shutdown from detaching from the tty with fork(2)/ exit(3).

     time     Time is the time at which shutdown will bring the system down and may be the word
	      now or a future time in one of two formats: +number, or [[[[[cc]yy]mm]dd]hh]mm,
	      where the century, year, month, day, and hour may be defaulted to the current sys-
	      tem values.  The first form brings the system down number minutes from the current
	      time; the second brings the system down at the absolute time specified.  If the
	      century is not specified, it defaults to 1900 for years between 69 and 99, or 2000
	      for years between 0 and 68.  A leading zero in the ``yy'' value is not optional.

     message ...
	      Any other arguments comprise the warning message that is broadcast to users cur-
	      rently logged into the system.

     -	      If - is supplied as the only argument after the time, the warning message is read
	      from the standard input.

BEHAVIOR
     At intervals, becoming more frequent as apocalypse approaches and starting at ten hours
     before shutdown, warning messages are displayed on the terminals of all users logged in.
     Five minutes before shutdown, or immediately 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.  Next a message is printed announcing the start
     of the system shutdown hooks.  Then the shutdown hooks in /etc/rc.shutdown are run, and a
     message is printed indicating that they have completed.  After a short delay, shutdown runs
     halt(8) or reboot(8), or sends a terminate signal to init(8) to bring the system down to
     single-user mode, depending on the choice of options.

     The time of the shutdown and the warning message are placed in /etc/nologin and should be
     used to tell the users why the system is going down, when it will be back up, and to share
     any other pertinent information.

FILES
     /etc/nologin      tells login(1) not to let anyone log in
     /fastboot	       tells rc(8) not to run fsck(8) when rebooting
     /etc/rc.shutdown  System shutdown commands

SEE ALSO
     login(1), wall(1), fastboot(8), halt(8), init(8), poweroff(8), reboot(8), rescue(8)

BACKWARD COMPATIBILITY
     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					 October 4, 2011				      BSD


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