RUNLEVEL(8) Linux System Administrator's Manual RUNLEVEL(8)
runlevel -- find the current and previous system runlevel.
Runlevel reads the system utmp file (typically /var/run/utmp) to locate
the runlevel record, and then prints the previous and current system
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.
utmp The name of the utmp file to read.
Miquel van Smoorenburg, miquelsATcistron.nl
May 27, 1997 RUNLEVEL(8)