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Annotation of 43BSDReno/sbin/shutdown/shutdown.8, revision 1.1

1.1     ! root        1: .\" Copyright (c) 1988 The Regents of the University of California.
        !             2: .\" All rights reserved.
        !             3: .\"
        !             4: .\" Redistribution and use in source and binary forms are permitted provided
        !             5: .\" that: (1) source distributions retain this entire copyright notice and
        !             6: .\" comment, and (2) distributions including binaries display the following
        !             7: .\" acknowledgement:  ``This product includes software developed by the
        !             8: .\" University of California, Berkeley and its contributors'' in the
        !             9: .\" documentation or other materials provided with the distribution and in
        !            10: .\" all advertising materials mentioning features or use of this software.
        !            11: .\" Neither the name of the University nor the names of its contributors may
        !            12: .\" be used to endorse or promote products derived from this software without
        !            13: .\" specific prior written permission.
        !            14: .\" THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
        !            15: .\" WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
        !            16: .\" MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            17: .\"
        !            18: .\"    @(#)shutdown.8  6.7 (Berkeley) 6/24/90
        !            19: .\"
        !            20: .TH SHUTDOWN 8 "June 24, 1990"
        !            21: .UC 4
        !            22: .SH NAME
        !            23: shutdown \- close down the system at a given time
        !            24: .SH SYNOPSIS
        !            25: .B shutdown
        !            26: [
        !            27: .B -
        !            28: ] [
        !            29: .B \-fhkrn
        !            30: ]
        !            31: time [ warning-message ... ]
        !            32: .SH DESCRIPTION
        !            33: .I Shutdown
        !            34: provides an automated shutdown procedure which a super-user
        !            35: can use to notify users nicely when the system is shutting down,
        !            36: saving them from system administrators, hackers, and gurus, who
        !            37: would otherwise not bother with such niceties.
        !            38: .PP
        !            39: .I Time
        !            40: is the time at which \fIshutdown\fP will bring the system down and
        !            41: may be the word \fInow\fP (indicating an immediate shutdown) or
        !            42: specify a future time in one of two formats: \fI+number\fP, or
        !            43: \fIyymmddhhmm\fP, where the year, month, and day may be defaulted
        !            44: to the current system values.  The first form brings the system down in
        !            45: \fInumber\fP minutes and the second at the absolute time specified.
        !            46: .PP
        !            47: Any other arguments comprise the warning message that is broadcast
        !            48: to users currently logged into the system; if a single dash (``-'')
        !            49: is supplied as an option, the warning message is read from the standard
        !            50: input.
        !            51: .PP
        !            52: At intervals, which get closer together as apocalypse approaches,
        !            53: starting at ten hours before shutdown, warning messages are displayed
        !            54: at the terminals of all users on the system.  Five minutes before
        !            55: shutdown, or immediately if shutdown is in less than 5 minutes,
        !            56: logins are disabled by creating \fI/etc/nologin\fP and copying the
        !            57: warning message there.  If this file exists when a user attempts to
        !            58: log in, \fIlogin\fP(1) prints its contents and exits.  The file is
        !            59: removed just before \fIshutdown\fP exits.
        !            60: .PP
        !            61: At shutdown time a message is written in the system log, containing the
        !            62: time of shutdown, who ran shutdown and the reason.  Then a terminate
        !            63: signal is sent to \fIinit\fP to bring the system down to single-user state.
        !            64: Alternatively, if
        !            65: .B \-r,
        !            66: .B \-h,
        !            67: or
        !            68: .B \-k
        !            69: is used, then
        !            70: .I shutdown
        !            71: will exec
        !            72: .IR reboot (8),
        !            73: .IR halt (8),
        !            74: or avoid shutting the system down (respectively).
        !            75: (If it isn't obvious,
        !            76: .B \-k
        !            77: is to make people
        !            78: .I think
        !            79: the system is going down!)
        !            80: .PP
        !            81: With the
        !            82: .B \-f
        !            83: option,
        !            84: .I shutdown
        !            85: arranges, in the manner of
        !            86: .IR fastboot (8),
        !            87: that when the system is rebooted the file systems will not
        !            88: be checked.  The
        !            89: .B \-n
        !            90: option prevents the normal
        !            91: .IR sync (2)
        !            92: before stopping.
        !            93: .PP
        !            94: The time of the shutdown and the warning message
        !            95: are placed in \fI/etc/nologin\fP and should be used to
        !            96: inform the users about when the system will be back up
        !            97: and why it is going down (or anything else).
        !            98: .SH FILES
        !            99: .TP 15
        !           100: /etc/nologin
        !           101: tells login not to let anyone log in
        !           102: .TP 15
        !           103: /fastboot
        !           104: tells /etc/rc not to run fsck when rebooting
        !           105: .SH "SEE ALSO"
        !           106: login(1), wall(1), fastboot(8), halt(8), reboot(8)
        !           107: .SH "BACKWARD COMPATIBILITY"
        !           108: The hours and minutes in the second time format may be separated by
        !           109: a colon (``:'') for backward compatibility.
        !           110: 

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