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Annotation of cci/usr/src/man/man8/shutdown.8, revision 1.1

1.1     ! root        1: .TH SHUTDOWN 8 "1 April 1981"
        !             2: .UC 4
        !             3: .SH NAME
        !             4: shutdown \- close down the system at a given time
        !             5: .SH SYNOPSIS
        !             6: .B /etc/shutdown
        !             7: [
        !             8: .B \-k
        !             9: ] [
        !            10: .B \-r
        !            11: ] [
        !            12: .B \-h
        !            13: ]
        !            14: time [ warning-message ... ]
        !            15: .SH DESCRIPTION
        !            16: .I Shutdown
        !            17: provides an automated shutdown procedure which a super-user
        !            18: can use to notify users
        !            19: nicely when the system is shutting down, saving them from
        !            20: system administrators, hackers, and gurus, who would otherwise
        !            21: not bother with niceties.
        !            22: .LP
        !            23: .I Time
        !            24: is the time at which
        !            25: .I shutdown
        !            26: will bring the system down and
        !            27: may be the word
        !            28: .B now
        !            29: (indicating an immediate shutdown)
        !            30: or specify a future time in one of two formats:
        !            31: .BR + number
        !            32: and
        !            33: .RB hour : min.
        !            34: The first form brings the system down in
        !            35: .I number
        !            36: minutes
        !            37: and the second brings the system down at the time of day indicated
        !            38: (as a 24\-hour clock).
        !            39: .PP
        !            40: At intervals which get closer together as apocalypse approaches,
        !            41: warning messages are displayed at the terminals of all users on the
        !            42: system.  Five minutes before shutdown, or immediately if
        !            43: shutdown is in less than 5 minutes, logins are disabled by
        !            44: creating
        !            45: /etc/nologin
        !            46: and writing a message there.
        !            47: If this file exists when a user attempts to log in,
        !            48: .IR login (1)
        !            49: prints its contents
        !            50: and exits.
        !            51: The file is removed just before
        !            52: .I shutdown
        !            53: exits.
        !            54: .PP
        !            55: At shutdown time a
        !            56: message is written in the file /usr/adm/shutdownlog, containing the
        !            57: time of shutdown, who ran shutdown and the reason.
        !            58: Then a terminate signal is sent at
        !            59: .I init
        !            60: to bring the system down to single-user state.
        !            61: Alternatively, if
        !            62: .B \-r,
        !            63: .B \-h,
        !            64: or
        !            65: .B \-k
        !            66: was used, then
        !            67: .I shutdown
        !            68: will exec
        !            69: .IR reboot (8),
        !            70: .IR halt (8),
        !            71: or avoid shutting the system down (respectively).
        !            72: (If it isn't obvious,
        !            73: .B \-k
        !            74: is to make people
        !            75: .I think
        !            76: the system is going down!)
        !            77: .PP
        !            78: The time of the shutdown and the warning message
        !            79: are placed in /etc/nologin and should be used to
        !            80: inform the users about when the system will be back up
        !            81: and why it is going down (or anything else).
        !            82: .SH FILES
        !            83: .DT
        !            84: /etc/nologin   tells login not to let anyone log in
        !            85: .br
        !            86: /usr/adm/shutdownlog   log file for successful shutdowns.
        !            87: .SH "SEE ALSO"
        !            88: login(1), reboot(8)
        !            89: .SH BUGS
        !            90: Only allows you to kill the system between now and 23:59 if
        !            91: you use the absolute time for shutdown.

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