# 2.11BSD#431 - /usr/man/cat8/shutdown.0

    SHUTDOWN(8)	    UNIX Programmer's Manual	      SHUTDOWN(8)

    NAME
         shutdown - close down the system at a given time

    SYNOPSIS
         shutdown [ -k ] [ -r ] [ -h ] [ -f ] [ -n ] time [ warning-
         message ... ]

    DESCRIPTION
         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, hack-
         ers, and gurus, who would otherwise not bother with
         niceties.

         Time is the time at which shutdown will bring the system
         down and may be the word now (indicating an immediate shut-
         down) or specify a future time in one of two formats:
         +number and hour:min.  The first form brings the system down
         in number minutes and the second brings the system down at
         the time of day indicated (as a 24-hour clock).

         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 attempts to log in,
         login(1) prints its contents and exits.  The file is removed
         just before shutdown exits.

         At shutdown time a message is written in the system log,
         containing the time of shutdown, who ran shutdown and the
         reason.  Then a terminate signal is sent to init to bring
         the system down to single-user state.  Alternatively, if -r,
         -h, or -k was used, then shutdown will exec reboot(8),
         halt(8), or avoid shutting the system down (respectively).
         (If it isn't obvious, -k is to make people think the system
         is going down!)

         With the -f option, shutdown arranges, in the manner of
         fastboot(8), that when the system is rebooted the file sys-
         tems will not be checked.	The -n option prevents the normal
         sync(2) before stopping.

         The time of the shutdown and the warning message are placed
         in /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).

    FILES
         /etc/nologin   tells login not to let anyone log in

    Printed 11/24/99	November 16, 1996			1

    SHUTDOWN(8)	    UNIX Programmer's Manual	      SHUTDOWN(8)

    SEE ALSO
         login(1), reboot(8), fastboot(8)

    BUGS
         Only allows you to kill the system between now and 23:59 if
         you use the absolute time for shutdown.

    Printed 11/24/99	November 16, 1996			2

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