Run Linux Shell Script On Boot - linux

Question

I have a Shell script that I want to run on boot. Every time that I start the device It'll run the script in the background.
The script contains a while true loop and suppose to run constantly, at least until the device will be turned off. This is the script :
#!/bin/bash
cd /home/.../
while true
do
sh ./update_logs.sh
sleep 1
done
After of plenty of searches I've came up with too much information which made a salad in my head. I've been advised to get to this folder /etc/init.d and put down my script there by using special pattern (LSB-compliant) which looks like this :
!#/bin/sh
start () {
echo "application started";
./helloworld # you should use an absolute path here instead of ./
}
stop () {
}
case "$1" in
start)
start
;;
stop)
stop
;;
*)
echo "Usage start|stop";
esac
exit $?
Make the script executable by chmod +x, then make A symbolic link for the file by typing ln -s /etc/rc.d/init.d/run_update.sh /etc/init.d/rc5.d/S90run_update
This supposed to be the "hard way" while the "easy way" is putting my script in a folder /etc/rc.local where it shall boot my script after the main boot process.
Well, I don't have this kind of folder. What I to have in etc folder is rc.d which leads to sub folders : init.d rc0.d rc1.d rc2.d... rc6.d
If the solution is the hard way by writing the code above, what is the minimum that I need to include in it? since I see different type of codes which include ### with descriptions and run levels
I have a Linux Red Hat 4.6.3-2.

Answer 1

in DEBIAN script should have at top
#!/bin/sh
### BEGIN INIT INFO
# Provides: SCRIPT_NAME_HERE_NO_PATH
# Required-Start: $remote_fs $syslog
# Required-Stop: $remote_fs $syslog
# Default-Start: 2 3 4 5
# Default-Stop: 0 1 6
# Short-Description: Start daemon at boot time
# Description: Enable service provided by daemon.
### END INIT INFO
....
then in shell must enable rc system links
update-rc.d SCRIPT_NAME_HERE_NO_PATH defaults
update-rc.d SCRIPT_NAME_HERE_NO_PATH enable

Answer 2

OK I think I understand.
start a konsole session, then look for a hidden file called .bash_profile. If you do not find it in your home directory then it does not exit. Create it with pico (use pico .bash_profile).
If the file exist, edit it with a link to your script.
The next time you log into your system that file will run.
HOpe this helps.

Answer 3

1. Add below lines in intit.rc:
chmod 0755 /system/bin/shellscript_name //giving permissions to your shell_script
start name_your_service //starting your shellscrip
service name_your_service /system/bin/shellscript_name
class main
user root
group shell system
seclabel u:r:shell:s0
disabled
2. Goto the vendor directory and create your shell script under system/bin/shellscript_name.
3. Add your shell script under Android MakeFile:
include $(CLEAR_VARS)
LOCAL_MODULE := module_name
LOCAL_MODULE_OWNER := owner_name
LOCAL_MODULE_TAGS := optional
LOCAL_MODULE_CLASS := EXECUTABLES
LOCAL_SRC_FILES := path to your .sh
LOCAL_MODULE_PATH := $(PRODUCT_OUT)/system/bin/
include $(BUILD_PREBUILT)