telinit(8) [linux man page]

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

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 prob-
       ably 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 not recommended since Upstart is currently unable to preserve its
	      state, but is necessary when upgrading system libraries.

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 (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 PARTICU-
       LAR PURPOSE.

SEE ALSO

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

Upstart 							    2009-07-09								telinit(8)

Check Out this Related Man Page

RUNLEVEL(8)                                                          runlevel                                                          RUNLEVEL(8)

NAME

       runlevel - Print previous and current SysV runlevel

SYNOPSIS

       runlevel [options...]

OVERVIEW

       "Runlevels" are an obsolete way to start and stop groups of services used in SysV init. systemd provides a compatibility layer that maps
       runlevels to targets, and associated binaries like runlevel. Nevertheless, only one runlevel can be "active" at a given time, while systemd
       can activate multiple targets concurrently, so the mapping to runlevels is confusing and only approximate. Runlevels should not be used in
       new code, and are mostly useful as a shorthand way to refer the matching systemd targets in kernel boot parameters.

       Table 1. Mapping between runlevels and systemd targets
       +---------+-------------------+
       |Runlevel | Target            |
       +---------+-------------------+
       |0        | poweroff.target   |
       +---------+-------------------+
       |1        | rescue.target     |
       +---------+-------------------+
       |2, 3, 4  | multi-user.target |
       +---------+-------------------+
       |5        | graphical.target  |
       +---------+-------------------+
       |6        | reboot.target     |
       +---------+-------------------+

DESCRIPTION

       runlevel prints the previous and current SysV runlevel if they are known.

       The two runlevel characters are separated by a single space character. If a runlevel cannot be determined, N is printed instead. If neither
       can be determined, the word "unknown" is printed.

       Unless overridden in the environment, this will check the utmp database for recent runlevel changes.

OPTIONS

       The following option is understood:

       --help
           Print a short help text and exit.

EXIT STATUS

       If one or both runlevels could be determined, 0 is returned, a non-zero failure code otherwise.

ENVIRONMENT

       $RUNLEVEL
           If $RUNLEVEL is set, runlevel will print this value as current runlevel and ignore utmp.

       $PREVLEVEL
           If $PREVLEVEL is set, runlevel will print this value as previous runlevel and ignore utmp.

FILES

       /run/utmp
           The utmp database runlevel reads the previous and current runlevel from.

SEE ALSO

       systemd(1), systemd.target(5), systemctl(1)

systemd 237                                                                                                                            RUNLEVEL(8)

Linux and UNIX Man Pages

telinit(8) [linux man page]

Check Out this Related Man Page