title: Trying to compare two text files, and create a third based on information
body: <p>I have two text files, master.txt and 926.txt. If there is a line in 926.txt that is not in master.txt, I want to write to a new file, notinbook.txt.</p>
  
  <p>I wrote the best thing I could think of, but given that I'm a terrible/newbie programmer it failed. Here's what I have</p>
  
  <pre><code>g = File.new("notinbook.txt", "w")
  File.open("926.txt", "r") do |f|
    while (line = f.gets)
      x = line.chomp
      if
        File.open("master.txt","w") do |h|
        end
        while (line = h.gets)
          if line.chomp != x
            puts line
          end
        end
      end
    end
  end
  g.close
  </code></pre>
  
  <p>Of course, it fails. Thanks!</p>