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.
If no option is specified, the default action is to bring the system down into
single-user mode.
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 runlevel (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
runlevel.
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)