Date: Sat, 20 Mar 1999 14:23:20 -0500 From: Paul Murphy <pmurphy@earthling.net> To: freebsd-questions@FreeBSD.ORG Subject: Re: runlevels ? Message-ID: <36F3F5A8.59CAF79A@earthling.net> References: <4.1.19990317173322.00918930@mail-r> <36F0BB50.6F2309@uk.radan.com>
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From Slackware Linux man page [INIT(8)]:
RUNLEVELS
A runlevel is a software configuration of the system which
allows only a selected group of processes to exist. The
processes spawned by init for each of these runlevels are
defined in the /etc/inittab file. Init can be in one of
eight runlevels: 0-6 and S or s. The runlevel is changed
by having a privileged user run telinit, which sends
appropriate signals to init, telling it which runlevel to
change to.
[snip]
After it has spawned all of the processes specified, init
waits for one of its descendant processes to die, a power-
fail signal, or until it is signaled by telinit to change
the system's runlevel. When one of the above three condi-
tions occurs, it re-examines the /etc/inittab file. New
entries can be added to this file at any time. However,
init still waits for one of the above three conditions to
occur. To provide for an instantaneous response, the
telinit Q or q command can wake up init to re-examine the
/etc/inittab file.
[snip]
ENVIRONMENT
Init sets the following environment variables for all its
children:
PATH /usr/local/sbin:/sbin:/bin:/usr/sbin:/usr/bin
INIT_VERSION
As the name says. Useful to determine if a script
runs directly from init.
[note: this may be the answer to the ORIGINAL question]
RUNLEVEL
The current system runlevel.
PREVLEVEL
The previous runlevel (useful after a runlevel
switch).
CONSOLE
The system console. This is really inherited from
the kernel; however if it is not set init will set
it to /dev/console by default.
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