Script to start/stop application in linux/unix : Gracefully/Smartly/Startup script

#!/bin/sh

APPLICATION_BIN_DIR=/opt/application/bin

prog=application_name


start()
{       pid_check=`ps -eaf | grep application_name | awk '{print $2}'`
        if [ -z "$pid_check" ]; then
        echo $"Starting $prog: ......."
        $APPLICATION_BIN_DIR/StartUp_Script.sh > /dev/null 2> /dev/null &
        sleep 15s
        pid=`ps -eaf | grep application_name | awk '{print $2}'`
        if [ -z $pid ]; then echo  " Application is  not running.Please start it again..."; exit 0;else
        echo "Application_name is running with PID ($pid)....Done";fi
        else
        echo "Another Instance of Application_name is already running.Please shutdown it first."
        fi
}


status ()
{
pid=`ps -eaf | grep application_name | awk '{print $2}'`
if [ -z $pid ]; then echo  " Application_name application is  not running."; exit 0;else
echo "Application_name is running with PID ($pid)....";fi
}




stop()
{
    echo  $"Shutting down $prog:.... "
   pid=`ps -eaf | grep application_name | awk '{print $2}'`
   if [ -z $pid ]; then echo  " application_name application is  not running.Please start it first."; exit 0;fi
        kill  -15 $pid
        sleep 15s
        kill -9 $pid
        pid_check=`ps -eaf | grep application_name | awk '{print $2}'`
        if [ -z "$pid_check" ]; then echo Application_name shutdown complete; else  echo Application_nameshutdown did not compelete; fi
       

}


case "$1" in
        start)
                start
                ;;
        status)
                status
                ;;
        stop)
                stop
                ;;

        restart)
                stop
                start
                ;;
    
        *)
                echo $"Usage: $0 {start|status|stop|restart}"
               
esac
label:Scripting