Comment créer un script init sur Ubuntu 14.04

cd /etc/init.d

vi my_init_script

#! /bin/sh

export PIDFILE=/var/run/my_init_script.pid
 ##### Check if Pidfile exits ####
 if [ -f ${PIDFILE} ]; then
     echo "Pidfile already exits (${PIDFILE})"
     echo "Please run rm -f ${PIDFILE}"
     exit 0
 fi

 ##Get the process number for our pidfile
 ps aux | grep -i "/etc/init.d/my_init_script" | grep -v "grep"  | head -n 1 | awk '{print $2}' > ${PIDFILE}


case "$1" in
 start)
  echo "votre code start ici"
   ;;
 stop)
    echo "votre code stop ici"
   sleep 10
   ;;
 restart)
    echo "votre code stop ici"
   sleep 20
    echo "votre code start ici"
   ;;
 *)
   echo "Usage: my_init_script {start|stop|restart}" >&2
      if [ -f ${PIDFILE} ]; then
          rm -f ${PIDFILE}
      fi
   exit 3
   ;;
esac

#remove pidfile
 if [ -f ${PIDFILE} ]; then
     rm -f ${PIDFILE}
 fi

chmod +x my_init_script

bash -n my_init_script

./my_init_script

update-rc.d my_init_script defaults