telinit – change system runlevel
telinit
[OPTION]…
RUNLEVEL
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.
telinit
may be also used to send basic commands to the
init(8)
daemon for compatibility with System V. These are:
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.
daemon re-execute itself. This is not recommended since Upstart is currently
unable to preserve its state, but is necessary when upgrading system
libraries.
and
PREVLEVEL.
will read the current runlevel from this environment variable if set in
preference to reading from
/var/run/utmp
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.
Written by Scott James Remnant
<[email protected]>
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)
initctl(8)
shutdown(8)
runlevel(8)