Process Checker Shell Script

forever.sh

#!/bin/bash

PIDFILE=/var/www/html/ajc.pid

if [ -f $PIDFILE ]
then
  PID=$(cat $PIDFILE)
  ps -p $PID > /dev/null 2>&1
  if [ $? -eq 0 ]
  then
    # echo "Process already running"
    exit 1
  else
    # Process not found assume not running
    echo $$ > $PIDFILE
    if [ $? -ne 0 ]
    then
      echo "Could not create PID file"
      exit 1
    fi
  fi
else
  echo $$ > $PIDFILE
  if [ $? -ne 0 ]
  then
    echo "Could not create PID file"
    exit 1
  fi
fi

# command to run
php ajc.php >> ~/ajc.log

# remove PID file
rm $PIDFILE