shutdown(1M-BSD)  MISC. REFERENCE MANUAL PAGES   shutdown(1M-BSD)



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  indi-
     cated  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  shut-
     down,  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 shut-
     down, 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).

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



                                                                1

shutdown(1M-BSD)  MISC. REFERENCE MANUAL PAGES   shutdown(1M-BSD)



                         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.













































                                                                2