244 lines
6.2 KiB
Groff
244 lines
6.2 KiB
Groff
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.\" $NetBSD: shutdown.8,v 1.31 2011/10/04 07:25:34 dholland Exp $
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.\"
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.\" Copyright (c) 1988, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)shutdown.8 8.2 (Berkeley) 4/27/95
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.\"
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.Dd October 4, 2011
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.Dt SHUTDOWN 8
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.Os
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.Sh NAME
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.Nm shutdown
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.Nd close down the system at a given time
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.Sh SYNOPSIS
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.Nm
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.Op Fl Ddfhknprvxz
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.Op Fl b Ar bootstr
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.Ar time
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.Op Ar message ... | Ar -
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.Sh DESCRIPTION
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.Nm
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provides an automated shutdown procedure for super-users
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to nicely notify users when the system is shutting down,
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saving them from system administrators, hackers, and gurus, who
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would otherwise not bother with such niceties.
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.Pp
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Available friendlinesses:
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.Bl -tag -width bootstr
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.It Fl b Ar bootstr
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The given
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.Ar bootstr
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is passed to
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.Xr reboot 8
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for the benefit of those systems that can pass boot arguments to the
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firmware.
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Currently, this only affects sun3 and sparc machines.
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.It Fl d
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.Nm
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will pass the
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.Fl d
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flag to
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.Xr reboot 8
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or
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.Xr halt 8
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to request a kernel core dump.
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If neither the
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.Fl h
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or
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.Fl r
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flags are specified, then
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.Fl d
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also implies
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.Fl r .
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.It Fl f
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.Nm
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arranges, in the manner of
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.Xr fastboot 8 ,
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for the file systems
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.Em not to be
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checked on reboot.
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.It Fl h
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The system is halted at the specified
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.Ar time ,
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using
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.Xr halt 8 .
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.It Fl k
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Kick everybody off.
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The
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.Fl k
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option
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does not actually halt the system, but leaves the
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system multi-user with logins disabled (for all but super-user).
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.It Fl n
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Prevent the normal
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.Xr sync 2
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before stopping.
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.It Fl p
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The system is powered down at the specified
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.Ar time ,
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using
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.Xr poweroff 8 .
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If the powerdown fails, or the system does not support software powerdown,
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the system will simply halt instead.
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.It Fl r
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The system is rebooted at the specified
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.Ar time ,
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using
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.Xr reboot 8 .
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.It Fl v
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To enable verbose messages on the console, pass
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.Fl v
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to
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.Xr reboot 8
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or
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.Xr halt 8 .
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.It Fl x
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To enable debugging messages on the console, pass
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.Fl x
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to
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.Xr reboot 8
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or
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.Xr halt 8 .
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.It Fl z
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To silence some shutdown messages on the console, pass
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.Fl z
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to
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.Xr reboot 8
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or
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.Xr halt 8 .
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.It Fl D
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Prevents
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.Nm
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from detaching from the tty with
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.Xr fork 2 Ns /
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.Xr exit 3 .
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.It Ar time
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.Ar Time
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is the time at which
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.Nm
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will bring the system down and
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may be the word
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.Ar now
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or a future time in one of two formats:
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.Ar +number ,
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or
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.Ar [[[[[cc]yy]mm]dd]hh]mm ,
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where the century, year, month, day, and hour may be defaulted
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to the current system values.
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The first form brings the system down
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.Ar number
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minutes from the current time; the second brings the system down at the
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absolute time specified.
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If the century is not specified, it defaults to 1900 for years between 69
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and 99, or 2000 for years between 0 and 68.
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A leading zero in the
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.Dq yy
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value is
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.Em not
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optional.
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.It Ar message ...
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Any other arguments comprise the warning message that is broadcast
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to users currently logged into the system.
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.It Ar -
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If
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.Ar -
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is supplied as the only argument after the time, the warning message is read
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from the standard input.
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.El
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.Sh BEHAVIOR
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.Pp
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At intervals, becoming more frequent as apocalypse approaches
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and starting at ten hours before shutdown, warning messages are displayed
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on the terminals of all users logged in.
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Five minutes before shutdown, or immediately if shutdown is in less
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than 5 minutes, logins are disabled by creating
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.Pa /etc/nologin
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and copying the warning message there.
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If this file exists when a user attempts to log in,
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.Xr login 1
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prints its contents and exits.
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The file is removed just before
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.Nm
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exits.
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.Pp
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At shutdown time, a message is written in the system log containing the
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time of shutdown, who initiated the shutdown, and the reason.
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Next a message is printed announcing the start of the system shutdown hooks.
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Then the shutdown hooks in
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.Pa /etc/rc.shutdown
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are run, and a message is printed indicating that they have completed.
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After a short delay,
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.Nm
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runs
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.Xr halt 8
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or
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.Xr reboot 8 ,
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or sends a terminate
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signal to
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.Xr init 8
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to bring the system down to single-user mode, depending on the choice
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of options.
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.Pp
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The time of the shutdown and the warning message are placed in
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.Pa /etc/nologin
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and should be used to tell the users why the system is
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going down, when it will be back up, and to share any other pertinent
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information.
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.Sh FILES
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.Bl -tag -width /etc/rc.shutdown -compact
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.It Pa /etc/nologin
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tells
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.Xr login 1
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not to let anyone log in
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.It Pa /fastboot
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tells
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.Xr rc 8
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not to run
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.Xr fsck 8
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when rebooting
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.It Pa /etc/rc.shutdown
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System shutdown commands
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.El
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.Sh SEE ALSO
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.Xr login 1 ,
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.Xr wall 1 ,
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.Xr fastboot 8 ,
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.Xr halt 8 ,
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.Xr init 8 ,
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.Xr poweroff 8 ,
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.Xr reboot 8 ,
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.Xr rescue 8
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.Sh BACKWARD COMPATIBILITY
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The hours and minutes in the second time format may be separated by
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a colon (``:'') for backward compatibility.
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.Sh HISTORY
|
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The
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.Nm
|
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command appeared in
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.Bx 4.0 .
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