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Annotation of 43BSDTahoe/man/man8/shutdown.8, revision 1.1

1.1     ! root        1: .\" Copyright (c) 1980 Regents of the University of California.
        !             2: .\" All rights reserved.  The Berkeley software License Agreement
        !             3: .\" specifies the terms and conditions for redistribution.
        !             4: .\"
        !             5: .\"    @(#)shutdown.8  6.4 (Berkeley) 5/26/86
        !             6: .\"
        !             7: .TH SHUTDOWN 8 "May 26, 1986"
        !             8: .UC 4
        !             9: .SH NAME
        !            10: shutdown \- close down the system at a given time
        !            11: .SH SYNOPSIS
        !            12: .B /etc/shutdown
        !            13: [
        !            14: .B \-k
        !            15: ] [
        !            16: .B \-r
        !            17: ] [
        !            18: .B \-h
        !            19: ] [
        !            20: .B \-f
        !            21: ] [
        !            22: .B \-n
        !            23: ]
        !            24: time [ warning-message ... ]
        !            25: .SH DESCRIPTION
        !            26: .I Shutdown
        !            27: provides an automated shutdown procedure which a super-user
        !            28: can use to notify users
        !            29: nicely when the system is shutting down, saving them from
        !            30: system administrators, hackers, and gurus, who would otherwise
        !            31: not bother with niceties.
        !            32: .LP
        !            33: .I Time
        !            34: is the time at which
        !            35: .I shutdown
        !            36: will bring the system down and
        !            37: may be the word
        !            38: .B now
        !            39: (indicating an immediate shutdown)
        !            40: or specify a future time in one of two formats:
        !            41: .BR + number
        !            42: and
        !            43: .RB hour : min.
        !            44: The first form brings the system down in
        !            45: .I number
        !            46: minutes
        !            47: and the second brings the system down at the time of day indicated
        !            48: (as a 24\-hour clock).
        !            49: .PP
        !            50: At intervals which get closer together as apocalypse approaches,
        !            51: warning messages are displayed at the terminals of all users on the
        !            52: system.  Five minutes before shutdown, or immediately if
        !            53: shutdown is in less than 5 minutes, logins are disabled by
        !            54: creating
        !            55: /etc/nologin
        !            56: and writing a message there.
        !            57: If this file exists when a user attempts to log in,
        !            58: .IR login (1)
        !            59: prints its contents
        !            60: and exits.
        !            61: The file is removed just before
        !            62: .I shutdown
        !            63: exits.
        !            64: .PP
        !            65: At shutdown time a
        !            66: message is written in the system log, containing the
        !            67: time of shutdown, who ran shutdown and the reason.
        !            68: Then a terminate signal is sent to
        !            69: .I init
        !            70: to bring the system down to single-user state.
        !            71: Alternatively, if
        !            72: .B \-r,
        !            73: .B \-h,
        !            74: or
        !            75: .B \-k
        !            76: was used, then
        !            77: .I shutdown
        !            78: will exec
        !            79: .IR reboot (8),
        !            80: .IR halt (8),
        !            81: or avoid shutting the system down (respectively).
        !            82: (If it isn't obvious,
        !            83: .B \-k
        !            84: is to make people
        !            85: .I think
        !            86: the system is going down!)
        !            87: .PP
        !            88: With the
        !            89: .B \-f
        !            90: option,
        !            91: .I shutdown
        !            92: arranges, in the manner of
        !            93: .IR fastboot (8),
        !            94: that when the system is rebooted the file systems will not
        !            95: be checked.  The
        !            96: .B \-n
        !            97: option prevents the normal
        !            98: .IR sync (2)
        !            99: before stopping.
        !           100: .PP
        !           101: The time of the shutdown and the warning message
        !           102: are placed in /etc/nologin and should be used to
        !           103: inform the users about when the system will be back up
        !           104: and why it is going down (or anything else).
        !           105: .SH FILES
        !           106: .DT
        !           107: /etc/nologin   tells login not to let anyone log in
        !           108: .SH "SEE ALSO"
        !           109: login(1), reboot(8), fastboot(8)
        !           110: .SH BUGS
        !           111: Only allows you to kill the system between now and 23:59 if
        !           112: you use the absolute time for shutdown.

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