title: Diff to get changed line from second file
body: <p>I have two files file1 and file2. I want to print the new line added to file2 using diff.<br>
  <strong>file1</strong>  </p>
  
  <pre><code>/root/a
  /root/b
  /root/c
  /root/d
  </code></pre>
  
  <p><strong>file2</strong></p>
  
  <pre><code>/root/new
  /root/new_new
  /root/a
  /root/b
  /root/c
  /root/d
  </code></pre>
  
  <p><strong>Expected output</strong></p>
  
  <pre><code>/root/new
  /root/new_new
  </code></pre>
  
  <p>I looked into man page but there was no any info on this</p>