c4d9468ea0
Avoid using parenthesis enclosure macros (.Pq and .Po/.Pc) with plain text. Not only this slows down the mdoc(7) processing significantly, but it also has an undesired (in this case) effect of disabling hyphenation within the entire enclosed block.
178 lines
5.1 KiB
Groff
178 lines
5.1 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. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. 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 December 11, 1998
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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
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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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.Sh DESCRIPTION
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.Nm Shutdown
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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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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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is 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 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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is specified, prevent the file system cache from being flushed by passing
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.Fl n
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option 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 word
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.Ar now
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(indicating an immediate shutdown) or
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specify 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. 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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.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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.Ql 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. 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. 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. 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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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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.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 login not to let anyone log in
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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 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 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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