BSD 4_4 release

[unix-history] / usr / src / sbin / shutdown / shutdown.8

diff --git a/usr/src/sbin/shutdown/shutdown.8 b/usr/src/sbin/shutdown/shutdown.8
index 3395637..d582569 100644 (file)
--- a/usr/src/sbin/shutdown/shutdown.8
+++ b/usr/src/sbin/shutdown/shutdown.8
@@ -1,96 +1,162 @@
-.\" Copyright (c) 1980 Regents of the University of California.
-.\" All rights reserved.  The Berkeley software License Agreement
-.\" specifies the terms and conditions for redistribution.
+.\" Copyright (c) 1988, 1991, 1993
+.\"    The Regents of the University of California.  All rights reserved.

 .\"
 .\"

-.\"    @(#)shutdown.8  4.1 (Berkeley) %G%
+.\" 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.

 .\"
 .\"

-.TH SHUTDOWN 8 4/1/81
-.UC 4
-.SH NAME
-shutdown \- close down the system at a given time
-.SH SYNOPSIS
-.B /etc/shutdown
-[
-.B \-k
-] [
-.B \-r
-] [
-.B \-h
-]
-time [ warning-message ... ]
-.SH DESCRIPTION
-.I Shutdown
-provides an automated shutdown procedure which a super-user
-can use to notify users
-nicely when the system is shutting down, saving them from
-system administrators, hackers, and gurus, who would otherwise
-not bother with niceties.
-.LP
-.I Time
+.\" 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
+.\"
+.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 fhkrn
+.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
+Available friendlinesses:
+.Bl -tag -width time
+.It Fl f
+.Nm Shutdown
+arranges, in the manner of
+.Xr fastboot 8 ,
+for the file systems
+.Em not to be
+checked on reboot.
+.It Fl h
+The system is halted at the specified
+.Ar time
+when
+.Nm shutdown
+execs
+.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 r 
+.Nm Shutdown
+execs
+.Xr reboot 8
+at the specified
+.Ar time .
+.It Ar time
+.Ar Time

 is the time at which
 is the time at which

-.I shutdown
+.Nm shutdown

 will bring the system down and
 will bring the system down and

-may take two formats:
-.BR + number
-and
-.RB hour : min.
-The first form brings the system down in
-.I number
-minutes
-and the second brings the system down at the time of day indicated
-(as a 24\-hour clock).
-.PP
-At intervals which get closer together as apocalypse approaches,
-warning messages are displayed at the terminals of all users on the
-system.  Five minutes before shutdown, or immediately if
-shutdown is in less than 5 minutes, logins are disabled by
-creating
-/etc/nologin
-and writing a message there.
-If this file exists when a user logs in,
-.IR login (1)
-prints its contents
-and exits.
-The file is removed just before
-.I shutdown
-exits.
-.PP
-At shutdown time a
-message is written in the file /usr/adm/shutdownlog, containing the
-time of shutdown, who ran shutdown and the reason.
-Then a terminate signal is sent at
-.I init
-to bring the system down to single-user state.
-Alternatively, if
-.B -r,
-.B -h,
+may be the word
+.Ar now
+(indicating an immediate shutdown) or
+specify a future time in one of two formats:
+.Ar +number ,

 or
 or

-.B -k
-was used, then
-.I shutdown
-will exec
-.IR reboot (8),
-.IR halt (8),
-or avoid shutting the system down (respectively).
-(If it isn't obvious,
-.B \-k
-is to make people
-.I think
-the system is going down!)
-.PP
+.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 shutdown
+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
+to bring the system down to single-user state (depending on above
+options).

 The time of the shutdown and the warning message
 The time of the shutdown and the warning message

-are placed in /etc/nologin and should be used to
+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).
 inform the users about when the system will be back up
 and why it is going down (or anything else).

-.SH FILES
-.DT
-/etc/nologin   tells login not to let anyone log in
-.br
-/usr/adm/shutdownlog   log file for succesful shutdowns.
-.SH "SEE ALSO"
-login(1), reboot(8)
-.SH BUGS
-Only allows you to kill the system between now and 23:59 if
-you use the absolute time for shutdown.
-.PP
-Times to shutdown are not nice and round, i.e. ``shutdown in 18 seconds''.
+.Sh FILES
+.Bl -tag -width /etc/nologin -compact
+.It Pa /etc/nologin
+tells login not to let anyone log in
+.It Pa /fastboot
+tells
+.Xr rc 8
+not to run fsck when rebooting
+.El
+.Sh SEE ALSO
+.Xr login 1 ,
+.Xr wall 1 ,
+.Xr fastboot 8 ,
+.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 .