title: How to read 1 line from 2 files sequentially?
body: <p>How do I read from 2 files 1 line at a time? Say if I have file1 and file2 with following content:</p>
  
  <p><strong>file1:</strong></p>
  
  <pre><code>line1.a    
  line2.a   
  line3.a   
  </code></pre>
  
  <p><strong>file2:</strong></p>
  
  <pre><code>line1.b   
  line2.b   
  line3.b   
  </code></pre>
  
  <p>How do I get output like this - </p>
  
  <pre><code>line1.a   
  line1.b   
  line2.a   
  line2.b   
  line3.a   
  line3.b   
  ...
  ...
  </code></pre>