Dirty hacky world-writability check

gistfile1.rb

def world_writable?(write_bit)
  if write_bit > 3
    write_bit -= 4
    return false if write_bit == 0
    write_bit % 2 == 0 ? true : false
  elsif write_bit < 4
    return false if write_bit == 0
    write_bit % 2 == 0 ? true : false
  end
end

file_write_bit = Integer(sprintf("%o", File.stat('/path/to/file').mode)[-1,1])

world_writable?(file_write_bit)