runlevel - SysV-init compatibility layer

       This  program  always prints a compatibility string that is used by update-rc.d program and by some other
       initscript, like kexec.
       During stage 2 the `N2' string is printed.
       During stage 3, if runit was told to reboot the system, the `N6' string is printed; a `N0'  string  is
       printed otherwise.

       runlevel - SysV-init compatibility layer

runit(8),update-rc.d(8)

                                                  Jan  3, 2022                                       RUNLEVEL(8)

/sbin/runlevel