runlevel(8) [redhat man page]

RUNLEVEL(8)						Linux System Administrator's Manual					       RUNLEVEL(8)

NAME

       runlevel -- find the current and previous system runlevel.

SYNOPSIS

       runlevel [utmp]

DESCRIPTION

       Runlevel  reads the system utmp file (typically /var/run/utmp) to locate the runlevel record, and then prints the previous and current sys-
       tem runlevel on its standard output, separated by a single space. If there is no previous system runlevel, the letter  N  will  be  printed
       instead.

       If no utmp file exists, or if no runlevel record can be found, runlevel prints the word unknown and exits with an error.

       Runlevel can be used in rc scripts as a substitute for the System-V who -r command.  However, in newer versions of init(8) this information
       is also available in the environment variables RUNLEVEL and PREVLEVEL.

OPTIONS

       utmp   The name of the utmp file to read.

SEE ALSO

       init(8), utmp(5)

AUTHOR

       Miquel van Smoorenburg, miquels@cistron.nl

								   May 27, 1997 						       RUNLEVEL(8)

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)