fbbd9655e5
Renumber cluase 4 to 3, per what everybody else did when BSD granted them permission to remove clause 3. My insistance on keeping the same numbering for legal reasons is too pedantic, so give up on that point. Submitted by: Jan Schaumann <jschauma@stevens.edu> Pull Request: https://github.com/freebsd/freebsd/pull/96
224 lines
5.8 KiB
Groff
224 lines
5.8 KiB
Groff
.\" 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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.\" $FreeBSD$
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.\"
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.Dd September 21, 2016
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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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.Nm poweroff
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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
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.Oo
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.Fl h | Fl p |
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.Fl r | Fl k
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.Oc
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.Oo
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.Fl o
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.Op Fl n
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.Oc
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.Ar time
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.Op Ar warning-message ...
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.Nm poweroff
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.Sh DESCRIPTION
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The
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.Nm
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utility 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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The following options are available:
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.Bl -tag -width indent
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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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.It Fl p
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The system is halted and the power is turned off
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(hardware support required)
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at the specified
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.Ar time .
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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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.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 o
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If one of the
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.Fl h ,
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.Fl p
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or
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.Fl r
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options are specified,
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.Nm
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will execute
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.Xr halt 8
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or
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.Xr reboot 8
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instead of sending a signal to
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.Xr init 8 .
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.It Fl n
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If the
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.Fl o
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option is specified, prevent the file system cache from being flushed by passing
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.Fl n
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to
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.Xr halt 8
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or
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.Xr reboot 8 .
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This option should probably not be used.
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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 case-insensitive word
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.Ar now
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(indicating an immediate shutdown) or
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a future time in one of two formats:
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.Ar +number ,
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or
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.Ar yymmddhhmm ,
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where the year, month, and day may be defaulted
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to the current system values.
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The first form brings the system down in
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.Ar number
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minutes and the second at the absolute time specified.
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.Ar +number
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may be specified in units other than minutes by appending the corresponding
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suffix:
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.Dq Li s ,
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.Dq Li sec ,
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.Dq Li m ,
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.Dq Li min .
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.Dq Li h ,
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.Dq Li hour .
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.It Ar warning-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 Fl
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If
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.Sq Fl
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is supplied as an option, the warning message is read from the standard
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input.
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.El
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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
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shutdown, or immediately if shutdown is in less than 5 minutes,
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logins are disabled by creating
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.Pa /var/run/nologin
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and copying the
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warning message there.
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If this file exists when a user attempts to
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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
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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 to the system log, containing the
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time of shutdown, the person who initiated the shutdown and the reason.
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The corresponding signal is then sent to
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.Xr init 8
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to respectively halt, reboot or bring the system down to single-user state
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(depending on the above options).
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The time of the shutdown and the warning message
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are placed in
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.Pa /var/run/nologin
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and should be used to
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inform the users about when the system will be back up
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and why it is going down (or anything else).
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.Pp
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A scheduled shutdown can be canceled by killing the
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.Nm
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process (a
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.Dv SIGTERM
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should suffice).
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The
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.Pa /var/run/nologin
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file that
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.Nm
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created will be removed automatically.
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.Pp
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When run without options, the
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.Nm
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utility will place the system into single user mode at the
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.Ar time
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specified.
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.Pp
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Calling
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.Dq Nm poweroff
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is equivalent to running:
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.Bd -literal -offset indent
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shutdown -p now
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.Ed
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.Sh FILES
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.Bl -tag -width /var/run/nologin -compact
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.It Pa /var/run/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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.El
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.Sh EXAMPLES
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Reboot the system in 30 minutes and display a warning message on the terminals
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of all users currently logged in:
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.Pp
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.Dl # shutdown -r +30 \&"System will reboot\&"
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.Sh 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 SEE ALSO
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.Xr kill 1 ,
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.Xr login 1 ,
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.Xr wall 1 ,
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.Xr nologin 5 ,
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.Xr halt 8 ,
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.Xr init 8 ,
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.Xr reboot 8
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.Sh HISTORY
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A
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.Nm
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command was originally written by Ian Johnstone for UNSW's modified
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.At "6th Edn" .
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It was modified and then incorporated in
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.Bx 4.1 .
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