155 lines
4.8 KiB
Groff
155 lines
4.8 KiB
Groff
.\" Copyright (c) 1988, 1991, 1993
|
|
.\" The Regents of the University of California. All rights reserved.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
.\" 3. All advertising materials mentioning features or use of this software
|
|
.\" must display the following acknowledgement:
|
|
.\" This product includes software developed by the University of
|
|
.\" California, Berkeley and its contributors.
|
|
.\" 4. Neither the name of the University nor the names of its contributors
|
|
.\" may be used to endorse or promote products derived from this software
|
|
.\" without specific prior written permission.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
.\" SUCH DAMAGE.
|
|
.\"
|
|
.\" @(#)shutdown.8 8.1 (Berkeley) 6/5/93
|
|
.\" $Id: shutdown.8,v 1.4 1998/08/03 06:22:43 charnier Exp $
|
|
.\"
|
|
.Dd June 5, 1993
|
|
.Dt SHUTDOWN 8
|
|
.Os BSD 4
|
|
.Sh NAME
|
|
.Nm shutdown
|
|
.Nd "close down the system at a given time"
|
|
.Sh SYNOPSIS
|
|
.Nm shutdown
|
|
.Op Fl
|
|
.Op Fl hkrn
|
|
.Ar time
|
|
.Op Ar warning-message ...
|
|
.Sh DESCRIPTION
|
|
.Nm 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.
|
|
.Pp
|
|
The following options are available:
|
|
.Bl -tag -width indent
|
|
.It Fl h
|
|
The system is halted at the specified
|
|
.Ar time
|
|
when
|
|
.Nm
|
|
executes
|
|
.Xr halt 8 .
|
|
.It Fl k
|
|
Kick every body off.
|
|
The
|
|
.Fl k
|
|
option
|
|
does not actually halt the system, but leaves the
|
|
system multi-user with logins disabled (for all but super-user).
|
|
.It Fl n
|
|
Prevent the normal
|
|
.Xr sync 2
|
|
before stopping.
|
|
.It Fl p
|
|
The system will turn the power off after shutdown if it can.
|
|
.It Fl r
|
|
.Nm Shutdown
|
|
executes
|
|
.Xr reboot 8
|
|
at the specified
|
|
.Ar time .
|
|
.It Ar time
|
|
.Ar Time
|
|
is the time at which
|
|
.Nm
|
|
will bring the system down and
|
|
may be the word
|
|
.Ar now
|
|
(indicating an immediate shutdown) or
|
|
specify a future time in one of two formats:
|
|
.Ar +number ,
|
|
or
|
|
.Ar yymmddhhmm ,
|
|
where the year, month, and day may be defaulted
|
|
to the current system values. The first form brings the system down in
|
|
.Ar number
|
|
minutes and the second at the absolute time specified.
|
|
.It Ar warning-message
|
|
Any other arguments comprise the warning message that is broadcast
|
|
to users currently logged into the system.
|
|
.It Fl
|
|
If
|
|
.Ql Fl
|
|
is supplied as an option, the warning message is read from the standard
|
|
input.
|
|
.El
|
|
.Pp
|
|
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
|
|
.Pa /etc/nologin
|
|
and copying the
|
|
warning message there. If this file exists when a user attempts to
|
|
log in,
|
|
.Xr login 1
|
|
prints its contents and exits. The file is
|
|
removed just before
|
|
.Nm
|
|
exits.
|
|
.Pp
|
|
At shutdown time a message is written in the system log, containing the
|
|
time of shutdown, who initiated the shutdown and the reason.
|
|
A terminate
|
|
signal is then sent to
|
|
.Xr init 8
|
|
to bring the system down to single-user state (depending on above
|
|
options).
|
|
The time of the shutdown and the warning message
|
|
are placed in
|
|
.Pa /etc/nologin
|
|
and should be used to
|
|
inform the users about when the system will be back up
|
|
and why it is going down (or anything else).
|
|
.Sh FILES
|
|
.Bl -tag -width /etc/nologin -compact
|
|
.It Pa /etc/nologin
|
|
tells login not to let anyone log in
|
|
.El
|
|
.Sh SEE ALSO
|
|
.Xr login 1 ,
|
|
.Xr wall 1 ,
|
|
.Xr nologin 5 ,
|
|
.Xr halt 8 ,
|
|
.Xr reboot 8
|
|
.Sh BACKWARD COMPATIBILITY
|
|
The hours and minutes in the second time format may be separated by
|
|
a colon (``:'') for backward compatibility.
|
|
.Sh HISTORY
|
|
The
|
|
.Nm
|
|
command appeared in
|
|
.Bx 4.0 .
|