BASH_Program_Check

BASH_Check_if_program_is_running.sh

#! /bin/bash

# Add an entry in your crontab to run this script on a timed interval

logfile="/var/log/app_check.log"

case "$(pidof app | wc -w)" in

0)  echo "App found not running, (re)starting app:     $(date)" >> $logfile
    DISPLAY=:0 /home/jdoe/app_script &
    ;;
1)  echo "App found running, all OK:     $(date)" >> $logfile
    ;;
*)  echo "Multiple instances of app found running. Stopping & restarting app:     $(date)" >> $logfile
    kill $(pidof app | awk '{print $1}')
    ;;
esac