shutdown(1Mbsd) (BSD System Compatibility)
shutdown --
(BSD) 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.
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 init state 1.
Command options
As an alternative to the above procedure, these options can be
specified:
- -f
-
Arrange, in the manner of
fastboot(1Mbsd),
that when the system is rebooted, the file systems will not
be checked.
- -h
-
Execute
halt(1Mbsd).
- -k
-
Simulate shutdown of the system.
Do not actually shut down the system.
- -n
-
Prevent the normal
sync(2)
before stopping.
- -r
-
Execute
reboot(1Mbsd).
Files
- /etc/xtab
-
list of remote hosts that have mounted this host
References
fastboot(1Mbsd),
halt(1Mbsd),
reboot(1Mbsd),
sync(2),
syslogd(1M)
Notices
Only allows you to bring the system down between
now and 23:59 if
you use the absolute time for shutdown.
30 January 1998
© 1998 The Santa Cruz Operation, Inc. All rights reserved.