NAME¶
telinit - change system runlevel
SYNOPSIS¶
telinit [
OPTION]...
RUNLEVEL
DESCRIPTION¶
telinit may be used to change the system runlevel.
The
RUNLEVEL argument should be one of the multi-user runlevels
2-5,
0 to halt the system,
6 to reboot the system or
1 to bring the system down into single-user mode.
Normally you would use the
shutdown(8) tool to halt or reboot the system,
or to bring it down to single-user mode.
RUNLEVEL may also be
S or
s which will place the system
directly into single-user mode without actually stopping processes first, you
probably won't want that.
The runlevel is changed 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.
telinit will write the new runlevel to
/var/run/utmp and append a
new entry to
/var/log/wtmp.
Other commands¶
telinit may be also used to send basic commands to the
init(8)
daemon for compatibility with System V. These are:
- Q or q
- to request that init(8) reload its configuration.
This is rarely necessary since Upstart watches its configuration with
inotify(7) and is deprecated by the initctl(8)
reload-configuration command.
- U or u
- to request that the init(8) daemon re-execute
itself. This is necessary when upgrading the Upstart init(8) daemon
itself or any of its dependent system libraries to ensure disks can be
unmounted cleanly on shutdown.
Note that if the init daemon is not Upstart, this option will have no
effect on the running init(8) daemon.
OPTIONS¶
- -e KEY=VALUE
- This specifies an additional environment variable to be
included in the event along with RUNLEVEL and
PREVLEVEL.
ENVIRONMENT¶
- RUNLEVEL
- telinit 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) initctl(8) shutdown(8)
runlevel(8)
