shutdown - bring the system down
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.
may have different formats, the most common is simply the word
' which will bring the system down immediately. Other valid formats
, 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
has elapsed, shutdown
sends a request to the
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
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.
- Requests that the system be rebooted after it has been brought down.
- 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.
- Requests that the system be halted after it has been brought down.
- Requests that the system be powered off after it has been brought
- Cancels a running shutdown. TIME is not specified with this option,
the first argument is MESSAGE.
- Only send out the warning messages and disable logins, do not actually
bring the system down.
- shutdown will read the current runlevel from this environment
variable if set in preference to reading from /var/run/utmp
- Where the current runlevel will be read from; this file will also be
updated with the new runlevel.
- A new runlevel record will be appended to this file for the new
The Upstart init(8)
daemon does not keep track of runlevels itself,
instead they are implemented entirely by its userspace tools.
for more details.
Written by Scott James Remnant <firstname.lastname@example.org
Report bugs at <https://launchpad.net/upstart/+bugs
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.
runlevel(7) init(8) telinit(8) reboot(8)