title: How can I combine lines from two files using sed, awk, or other linux commands
body: <p>I have two files:</p>
  
  <p>file1.txt </p>
  
  <blockquote>
    <blockquote>
      <p>apple </p>
      
      <p>orange</p>
      
      <p>banana</p>
    </blockquote>
  </blockquote>
  
  <p>file2.txt</p>
  
  <blockquote>
    <blockquote>
      <p>red</p>
      
      <p>white</p>
      
      <p>blue</p>
    </blockquote>
  </blockquote>
  
  <p>What I would like to end up with is this:</p>
  
  <p>file3.txt</p>
  
  <blockquote>
    <blockquote>
      <p>apple</p>
      
      <p>red</p>
      
      <p>orange</p>
      
      <p>white</p>
      
      <p>banana</p>
      
      <p>blue</p>
    </blockquote>
  </blockquote>
  
  <p>Any help would be greatly appreciated!</p>