Summery
システムをシャットダウンするConstruction
$ shutdown [option] [timing]
Option
-h : シャットダウン(halt) -r : リブート(restart) -q : メッセージ表示なし -f : 高速処理 [timing] now : すぐに終了する hh:ss : 指定した時間に終了する +min : 指定した分後に終了する
Sample
# システム終了する
$ sudo shutdown -h now
# 再起動する
$ sudo shutdown -r now
# 1時に終了する
$ sudo shutdown -h 0:0
Discription
NAME
shutdown - bring the system down
SYNOPSIS
shutdown [OPTION]... TIME [MESSAGE]
DESCRIPTION
shutdown arranges for the system to be brought down in a safe way. All
logged-in users are notified that the system is going down and, within the
last five minutes of TIME, new logins are prevented.
TIME may have different formats, the most common is simply the word 'now'
which will bring the system down immediately. Other valid formats are +m,
where m is the number of minutes to wait until shutting down and hh:mm which
specifies the time on the 24hr clock.
Once TIME has elapsed, shutdown sends a request to the init(8) daemon to
bring the system down into the appropriate runlevel.
This is performed by emitting the runlevel(7) event, which includes the new
runlevel in the RUNLEVEL environment variable as well as the previous run-
level (obtained from the environment or from /var/run/utmp) in the PREVLEVEL
variable. An additional INIT_HALT variable may be set, this will contain the
value HALT when bringing the system down for halt and POWEROFF when bringing
the system down for power off.
OPTIONS
-r Requests that the system be rebooted after it has been brought down.
-h Requests that the system be either halted or powered off after it has
been brought down, with the choice as to which left up to the system.
-H Requests that the system be halted after it has been brought down.
-P Requests that the system be powered off after it has been brought
down.
-c Cancels a running shutdown. TIME is not specified with this option,
the first argument is MESSAGE.
-k Only send out the warning messages and disable logins, do not actually
bring the system down.
ENVIRONMENT
RUNLEVEL
shutdown will read the current runlevel from this environment variable
if set in preference to reading from /var/run/utmp
FILES
/var/run/utmp
Where the current runlevel will be read from; this file will also be
updated with the new runlevel.
/var/log/wtmp
A new runlevel record will be appended to this file for the new run-
level.
NOTES
The Upstart init(8) daemon does not keep track of runlevels itself, instead
they are implemented entirely by its userspace tools.
See runlevel(7) for more details.
AUTHOR
Written by Scott James Remnant <scott @netsplit.com>
REPORTING BUGS
Report bugs at <https: //launchpad.net/upstart/+bugs>
COPYRIGHT
Copyright ? 2009 Canonical Ltd.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
SEE ALSO
runlevel(7) init(8) telinit(8) reboot(8)
Upstart 2009-07-09 shutdown(8)
