Files in the /rtc/rc.d/rc*.d directory

What are the files in the /rtc/rc.d/rc*.d directories ? All the files
are links to scripts located in /etc/rc.d/init.d, so are these the
scripts that are called when the system boots in each of the possible
runlevels ? And when the systems shuts down are the scripts in this
directory called as well ? Why there are some links starting with K
and another ones with S, are ones called during the boot and the
others during the shutdown ? Which ones when in that case ? And what
about the digital code after the letter S or K, what does it mean ?

Thanks

Dani Camps <danicamps81@gmail.com> wrote:
> What are the files in the /rtc/rc.d/rc*.d directories ? All the files
> are links to scripts located in /etc/rc.d/init.d, so are these the
> scripts that are called when the system boots in each of the possible
> runlevels ? And when the systems shuts down are the scripts in this
> directory called as well ? Why there are some links starting with K
> and another ones with S, are ones called during the boot and the
> others during the shutdown ? Which ones when in that case ? And what
> about the digital code after the letter S or K, what does it mean ?

You can get much more information than what I am going to give you
with a web search for "System V" initialization.

Like the good article on http://www.freeos.com/articles/3243/

Most of what you guess is correct.
The S* scripts ate called when you enter that runlevel, and the
K* scripts are called when you leave the runlevel (Start and Kill).
The number after the S or K defines a sequence in which the startup
or shutdown scripts are called: e.g. you want the network up before
you start NFS.
When you boot the machine, you enter the runlevel specified by the
initdefault entry in /etc/inittab.
When you shutdown the computer, you go to runlevel 0.

There are various menu- and GUI-driven tools that facilitate maintaining
the symbolic links in the /etc/rc.d directories.

Yours,
Laurenz Albe

On 22 Feb 2005 07:04:17 -0800, Dani Camps
<danicamps81@gmail.com> wrote:
> What are the files in the /rtc/rc.d/rc*.d directories ? All the files
> are links to scripts located in /etc/rc.d/init.d, so are these the
> scripts that are called when the system boots in each of the possible
> runlevels ? And when the systems shuts down are the scripts in this
> directory called as well ? Why there are some links starting with K
> and another ones with S, are ones called during the boot and the
> others during the shutdown ? Which ones when in that case ? And what
> about the digital code after the letter S or K, what does it mean ?
>

http://www.tldp.org/HOWTO/From-Power...mpt-HOWTO.html

danicamps81@gmail.com (Dani Camps) writes:

>What are the files in the /rtc/rc.d/rc*.d directories ? All the files
>are links to scripts located in /etc/rc.d/init.d, so are these the
>scripts that are called when the system boots in each of the possible

Yes.

>runlevels ? And when the systems shuts down are the scripts in this
>directory called as well ? Why there are some links starting with K

No. the ones in rc6.d are called.

>and another ones with S, are ones called during the boot and the

K=kill, S=start

>others during the shutdown ? Which ones when in that case ? And what
>about the digital code after the letter S or K, what does it mean ?

The order. The codes are sorted and run in order of sort. Since sort for
two digit numbers is numerical order, they are run in numerical order.

Laurenz Albe <albe@culturallNOSPAM.com> writes:

>Dani Camps <danicamps81@gmail.com> wrote:
>> What are the files in the /rtc/rc.d/rc*.d directories ? All the files
>> are links to scripts located in /etc/rc.d/init.d, so are these the
>> scripts that are called when the system boots in each of the possible
>> runlevels ? And when the systems shuts down are the scripts in this
>> directory called as well ? Why there are some links starting with K
>> and another ones with S, are ones called during the boot and the
>> others during the shutdown ? Which ones when in that case ? And what
>> about the digital code after the letter S or K, what does it mean ?

>You can get much more information than what I am going to give you
>with a web search for "System V" initialization.

>Like the good article on http://www.freeos.com/articles/3243/

>Most of what you guess is correct.
>The S* scripts ate called when you enter that runlevel, and the
>K* scripts are called when you leave the runlevel (Start and Kill).

No, both the K and S scripts are called when you enter. When you leave you
are in runlevel 6.
See /etc/rc.d/rc

*****************************
# Get first argument. Set new runlevel to this argument.
[ -n "$argv1" ] && runlevel="$argv1"

# Is there an rc directory for this new runlevel?
[ -d /etc/rc$runlevel.d ] || exit 0

# First, run the KILL scripts.
for i in /etc/rc$runlevel.d/K* ; do
check_runlevel "$i" || continue

# Check if the subsystem is already up.
subsys=${i#/etc/rc$runlevel.d/K??}
rc_splash $subsys
[ -f /var/lock/subsys/$subsys -o -f /var/lock/subsys/$subsys.init ] \
|| continue

# Bring the subsystem down.
if egrep -q "(killproc |action )" $i ; then
$i stop
else
action "Stopping %s: " $subsys $i stop
fi
done

# Now run the START scripts.
for i in /etc/rc$runlevel.d/S* ; do
check_runlevel "$i" || continue

# Check if the subsystem is already up.
subsys=${i#/etc/rc$runlevel.d/S??}
[ -f /var/lock/subsys/$subsys -o -f /var/lock/subsys/$subsys.init ] \
&& continue

# If we're in confirmation mode, get user confirmation
if [ -f /var/run/confirm ]; then
if [ "$subsys" = dm ]; then
CONFIRM_DM=1
continue
fi
confirm $subsys
case $? in
1) continue;;
2) rm -f /var/run/confirm;;
esac
fi

rc_splash $subsys

# Bring the subsystem up.
if [ "$subsys" = "halt" -o "$subsys" = "reboot" ]; then
export LC_ALL=C
exec $i start
fi

if [ "$subsys" = "single" ]; then
rc_splash stop
fi
if egrep -q "(daemon |action |success |failure )" $i 2>/dev/null \
|| [ "$subsys" = "single" -o "$subsys" = "local" ]; then
$i start
else
action "Starting %s: " $subsys $i start
fi

done

************************************************** ****************

So on entry to a runlevel, first the K scripts are run to kill of anything
that should not be run at that runlevel. Then the S scripts are run to
start up anything that should be started up at that runlevel




>The number after the S or K defines a sequence in which the startup
>or shutdown scripts are called: e.g. you want the network up before
>you start NFS.
>When you boot the machine, you enter the runlevel specified by the
>initdefault entry in /etc/inittab.
>When you shutdown the computer, you go to runlevel 0.
No 6

>There are various menu- and GUI-driven tools that facilitate maintaining
>the symbolic links in the /etc/rc.d directories.

Dani Camps said the following, on 02/22/05 10:04:
> What are the files in the /rtc/rc.d/rc*.d directories ? All the files
> are links to scripts located in /etc/rc.d/init.d, so are these the
> scripts that are called when the system boots in each of the possible
> runlevels ? And when the systems shuts down are the scripts in this
> directory called as well ? Why there are some links starting with K
> and another ones with S, are ones called during the boot and the
> others during the shutdown ? Which ones when in that case ? And what
> about the digital code after the letter S or K, what does it mean ?
>


Red Hat has a good description of these files and how they fit into the
boot process in their Linux _Reference Guide_, which is available on
their Web site. The section relevant to your question is:

<http://www.redhat.com/docs/manuals/linux/RHL-9-Manual/ref-guide/s1-boot-init-shutdown-process.html>

(Sorry about the length of the URL.)


--
Rich Gibbs
rgibbs@alumni.princeton.edu

Bill Unruh <unruh@string.physics.ubc.ca> wrote:
>>The S* scripts ate called when you enter that runlevel, and the
>>K* scripts are called when you leave the runlevel (Start and Kill).
>
> No, both the K and S scripts are called when you enter. When you leave you
> are in runlevel 6.

Sorry, and thanks for the correction.

Yours,
Laurenz Albe