shutdown(1M)            (BSD Compatibility Package)            shutdown(1M)


   NAME
         shutdown - close down the system at a given time

   SYNOPSIS
         /usr/ucb/shutdown [ -fhknr ] [ time [ warning-message ...  ]

   DESCRIPTION
         shutdown provides an automated procedure to notify users when the
         system is to be shut down.  time specifies when shutdown will bring
         the system down; it may be the word now (indicating an immediate
         shutdown), or it may 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 in 24-hour notation.

         At intervals that get closer as the apocalypse approaches, warning
         messages are displayed at terminals of all logged-in users, and of
         users who have remote mounts on that machine.  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(1M)
         prints its contents and exits.  The file is removed just before
         shutdown exits.

         At shutdown time a message is written to the system log daemon,
         syslogd(1M), containing the time of shutdown, the instigator of the
         shutdown, and the reason.  Then a terminate signal is sent to init,
         which brings the system down to single-user mode.

         The time of the shutdown and the warning message are placed in
         /etc/nologin, which should be used to inform the users as to when the
         system will be back up, and why it is going down (or anything else).

   OPTIONS
         As an alternative to the above procedure, these options can be
         specified:

         -f    Arrange, in the manner of fastboot(1M), that when the system is
               rebooted, the file systems will not be checked.

         -h    Execute halt(1M).

         -k    Simulate shutdown of the system. Do not actually shut down the
               system.

         -n    Prevent the normal sync(2) before stopping.

         -r    Execute reboot(1M).





   7/91                                                                 Page 1

   shutdown(1M)            (BSD Compatibility Package)            shutdown(1M)


   FILES
         /etc/nologin        tells login not to let anyone log in
         /etc/xtab           list of remote hosts that have mounted this host

   SEE ALSO
         fastboot(1M), halt(1M), reboot(1M), syslogd(1M).

         login(1) in the User's Reference Manual.
         sync(2) in the Programmer's Reference Manual.

   NOTES
         Only allows you to bring the system down between now and 23:59 if you
         use the absolute time for shutdown.








































   Page 2                                                                 7/91