filepath = "#{ARGV[0]}"
filesize = File.stat("#{filepath}").size

case filesize.to_i
when < ARGV[2]
  puts "Critical: Current file size is #{filesize} bytes"
  exit 2
when < ARGV[3]
  puts "Warning: Current file size is #{filesize} bytes"
  exit 1
when > ARGV[2] && filesize > ARGV[3]
  puts "OK: Current filesize is #{filesize} bytes"
  exit 0
end