title: Notepad++ add number in each line
body: <p>I have the following data in a text file</p>
  
  <pre><code>p=1
  p=1
  p=1
  p=1
  </code></pre>
  
  <p>etc. I open that file in Notepad++. </p>
  
  <p>How would I change it to</p>
  
  <pre><code>p=1
  p=2
  p=3
  p=4
  </code></pre>
  
  <p>etc.</p>