Shell Programming and Scripting

#!/bin/sh
file="File.dat"
size=60000
engineEXECUTE()
{
   sleep 2
   echo "In the engine function..."
   killENGINE
}
checkFILESIZE()
{
   sleep 2
   test -f $file || echo "$file not found" && exit 1
   FILESIZE=$(stat -c %s $file)
   if [ $FILESIZE -gt $size ]
   then
      echo "$file size is greater than $size..."
      engineEXECUTE
   else
      echo "$file size is less than $size..."
      checkFILESIZE
   fi
}
killENGINE()
{
   sleep 2
   echo "Inside KILLENGINE..."
 
   kill -9 $(pgrep CONTROLFILE)
   if [ $? -eq 0 ]
   then
      echo "CONTROLFILE process killed..."
   else
      echo "CONTROLFILE process not running... Exiting..."
      exit 1
   fi

   checkFILESIZE
}

checkFILESIZE