How to create an autostart script in Linux (Red Hat / CentOS / Fedora)

How to create an auto start script in Linux (Red Hat / CentOS / Fedora):
Option 1: Use chkconfig script to run /etc/init.d/…

1. Create a script and place in /etc/init.d (e.g /etc/init.d/myscript). The script should have the following format:

#!/bin/bash
# chkconfig: 2345 20 80
# Source function library.
. /etc/init.d/functions
start() {
    # code to start app comes here 
    # example: daemon program_name &
}
stop() {
    # code to stop app comes here 
    # example: killproc program_name
}
case "$1" in
    start)
       start
       ;;
    stop)
       stop
       ;;
    restart)
       stop
       start
       ;;
    status)
       # code to check status of app comes here 
       # example: status program_name
       ;;
    *)
       echo "Usage: $0 {start|stop|status|restart}"
esac
exit 0 

Enable the script

2. $ chkconfig --add myscript
   $ chkconfig --level 2345 myscript on
   

3. Check the script is indeed enabled – you should see “on” for the levels you selected.

   $ chkconfig --list | grep myscript
   

You can then use the script like so /etc/init.d/myscript start or chkconfig myscript start.
Option 2: Another Option is to use crontab job and run it at Boot time.
You need to use special string called @reboot. It will run once, at startup after reboot command.

@reboot  /path/to/job
@reboot  /path/to/shell.script
@reboot  /path/to/command

This is an easy way to give your users the ability to run a shell script or command at boot time without root access. First, run crontab command:
$ crontab -e
OR
# crontab -e -u doddi

Run a script called /home/doddi/bin/myScript.sh
@reboot /home/doddi/bin/myScript.sh 
Under RHEL / CentOS / Fedora, you need to enable crond on boot:
# chkconfig crond on
# service crond restart

If you are using modern distro with systemd, try
# systemctl enable crond.service
# systemctl restart crond.service
# systemctl status crond.service