opendarwin man page for runlevel

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)