151 lines
4.6 KiB
Groff
151 lines
4.6 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 8.1 (Berkeley) 6/5/93
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.\"
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.Dd June 5, 1993
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.Dt SHUTDOWN 8
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.Os BSD 4
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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 shutdown
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.Op Fl
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.Op Fl hkrn
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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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Available friendlinesses:
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.Bl -tag -width time
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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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when
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.Nm shutdown
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execs
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.Xr halt 8 .
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.It Fl k
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Kick every body 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 r
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.Nm Shutdown
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execs
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.Xr reboot 8
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at the specified
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.Ar time .
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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 shutdown
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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 /etc/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 shutdown
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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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A terminate
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signal is then sent to
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.Xr init
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to bring the system down to single-user state (depending on above
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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 /etc/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 /etc/nologin -compact
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.It Pa /etc/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 halt 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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