telinit manpage

Search topic Section

telinit(8)		    System Manager's Manual		    telinit(8)

       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 sys-
       tem, 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 proba-
       bly 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-configura-
	      tion command.

       U or u to request that the init(8) daemon re-execute itself.   This  is
	      not  recommended	since  Upstart is currently unable to preserve
	      its state, but is necessary when upgrading system libraries.

       -e KEY=VALUE
	      This specifies an additional environment variable to be included
	      in the event along with RUNLEVEL and PREVLEVEL.

	      telinit  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.

       See runlevel(7) for more details.

       Written by Scott James Remnant <scott@netsplit.com>

       Report bugs at <https://launchpad.net/upstart/+bugs>

       Copyright (C) 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

       runlevel(7) init(8) initctl(8) shutdown(8) runlevel(8)

Upstart				  2009-07-09			    telinit(8)