title: How to join two text files, removing duplicates, in Windows
body: <p>file 1</p>
  
  <pre><code>A
  B
  C
  </code></pre>
  
  <p>file 2</p>
  
  <pre><code>B
  C
  D
  </code></pre>
  
  <p>file1 + file2 =</p>
  
  <pre><code>A
  B
  C
  D
  </code></pre>
  
  <p>Is it possible to do using cmd.exe? </p>