class File
  def self.lastline(filename)
    line = ''
    File.open(filename, 'r') do |file|
      begin
        file.pos = File.size(filename) - 1
        begin
          line << file.getc
          file.pos -= 2
        end until line[-1, 1] == "\n"
      rescue Errno::EINVAL
      end
    end
    line.reverse.strip
  end
end