====== Initialization scripts ======
Initialization scripts are usually placed in **''/etc/init.d''**.

Start and stop functions are usually put in the same script.

===== Start scripts =====

Start scripts are executed at boot sequence. This can be used to launch automatically an application at startup.
Start scripts are to be placed in directory: **''/etc/rcU.d''** (to be executed after all firmware init scripts). \\
The name of the script must start with letter S and a number between 0 and 99 (example: ''S01myscript'').

===== Stop scripts =====

Stop scripts are executed at stop sequence. This can be used to properly stop an application before the shutdown.
Stop scripts are to be placed in directory: **''/etc/rcK.d''**. \\
The name of the script must start with letter K and a number between 0 and 99 (example: ''K01myscript'').

===== Example =====

For example, the following script, installed in ''/etc/init.d'', will switch on the red backhaul led at startup (on Wirnet iFemtoCell):
<file bash switchled>
#! /bin/sh
### BEGIN INIT INFO
# Short-Description:    Dummy init script
### END INIT INFO

set -e

case "$1" in
  start)
	echo -n "Starting Leds: "
        echo "heartbeat" > "/sys/class/leds/led2:red:backhaul/trigger"
	echo "done"
	;;
  stop)
	echo -n "Stopping LED: "
        echo "none" > "/sys/class/leds/led2:red:backhaul/trigger"
	echo "done"
	;;
  restart)
  	$0 stop
	$0 start
	;;
  *)
	echo "Usage: $0 { start | stop | restart }" >&2
	exit 1
	;;
esac

exit 0
</file>

Then create link in ''rcK.d'' and ''rcU.d'' directories as below:
<code bash>
ls -l /etc/rcU.d
drwxr-xr-x    2 root     root        4.0K Oct 29 19:44 .
drwxr-xr-x    5 root     root        4.0K Nov 13 14:00 ..
-rwxrwx---    1 root     root        1.0K Nov 24 08:07 S01switchled -> /etc/init.d/switchled

ls -l /etc/rcK.d
drwxr-xr-x    2 root     root        4.0K Oct 29 19:44 .
drwxr-xr-x    5 root     root        4.0K Nov 13 14:00 ..
-rwxrwx---    1 root     root        1.0K Nov 24 08:07 K01switchled -> /etc/init.d/switchled
</code>

<note important>Don't forget to make your script executable with command ''chmod +x''.</note>