title: Print lines from one file that are not contained in another file
body: <p>I wish to print lines that are in one file but not in another file.  However, neither files are sorted, and I need to retain the original order in both files.</p>
  
  <pre><code> contents of file1:
   string2
   string1
   string3
  
   contents of file2:
   string3
   string1
  
   Output:
   string2
  </code></pre>
  
  <p>Is there a simple script that I can accomplish this in?</p>