title: Multiplication of lines in bash
body: <p>I want to make something like multiplication:</p>
  
  <p>File1:</p>
  
  <pre><code>aa
  bb
  </code></pre>
  
  <p>File2:</p>
  
  <pre><code>cc
  dd
  </code></pre>
  
  <p>File3:</p>
  
  <pre><code>eee
  fff
  ggg
  </code></pre>
  
  <p>I want a result like:</p>
  
  <pre><code>aa cc eee
  aa cc fff
  aa cc ggg
  bb dd eee
  bb dd fff
  bb dd ggg
  </code></pre>
  
  <p>File1 &amp; File2 first element will multiply every element of File3, and same as second element of File1 &amp; File2 multiply with every element of File3.</p>