shutdown man page on Xenix

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SHUTDOWN(8)							   SHUTDOWN(8)

NAME
       shutdown - close down the system at a given time

SYNOPSIS
       shutdown [ - ] [ -fhkrn ] 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, hackers, and gurus, who would other‐
       wise not bother with such niceties.

       Time is the time at which shutdown will bring the system down  and  may
       be  the word now (indicating an immediate shutdown) or specify a future
       time in one of two formats: +number, or	yymmddhhmm,  where  the	 year,
       month,  and  day	 may  be  defaulted to the current system values.  The
       first form brings the system down in number minutes and the  second  at
       the absolute time specified.

       Any  other  arguments comprise the warning message that is broadcast to
       users currently logged into the system; if a  single  dash  (``-'')  is
       supplied	 as  an	 option, the warning message is read from the standard
       input.

       At intervals, which  get	 closer	 together  as  apocalypse  approaches,
       starting	 at  ten hours before shutdown, warning messages are displayed
       at the terminals of all users on the system.  Five minutes before shut‐
       down,  or immediately if shutdown is in less than 5 minutes, logins are
       disabled by creating  /etc/nologin  and	copying	 the  warning  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	 shut‐
       down 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	 is  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 systems 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 sys‐
       tem will be back up and why it is going down (or anything else).

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

       /fastboot      tells /etc/rc not to run fsck when rebooting

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

BACKWARD COMPATIBILITY
       The  hours  and minutes in the second time format may be separated by a
       colon (``:'') for backward compatibility.

4th Berkeley Distribution	 June 24, 1990			   SHUTDOWN(8)
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