selenium webdriver as background

selenium-server.sh

#!/bin/bash 
 
# Start the service selenium-server 
start() { 
  echo "Starting selenium-server server." 
  export DISPLAY=:0 
  java -jar /Users/tw/Projects/test/selenium-server-standalone-2.35.0.jar -role hub &>/dev/null & 
  PID=$! 
  ### Create the lock file ### 
  echo $PID > /var/run/selenium-server.pid 
  echo $"selenium-server server startup $PID." 
} 
 
# Restart the service selenium-server 
stop() { 
  echo "Stopping selenium-server server." 
  cat /var/run/selenium-server.pid | xargs kill -15 
  ### Now, delete the PID file ### 
  rm -f /var/run/selenium-server.pid
} 
 
### main logic ### 
case "$1" in 
  start) 
    start 
    ;; 
  stop) 
    stop 
    ;; 
  status) 
    if [ -f /var/run/selenium-server.pid ]; then
      PID=`cat /var/run/selenium-server.pid`
      if [ $PID -gt 0 ]; then
        echo "Selenium server is running with process id $PID."
      fi
    else
      echo 'Selenium server is not running.'
    fi
    ;; 
  restart|reload|condrestart) 
    stop 
    start 
    ;; 
  *) 
  echo $"Usage: $0 {start|stop|restart|reload|status}" 
  exit 1 
esac 
 
exit 0