title: How to directly append columns of one file to another file
body: <p>Requirement: Only grep/cut/join/cat/regex/for/while.</p>
  
  <p>I am a beginner at shell utilities.</p>
  
  <p>I have fileA and fileB containing equal number of rows. I want to append columns of fileB into fileA.</p>
  
  <p>I am trying this <code>(cat fileA &amp;&amp; cat fileB) &gt; fileC</code>. But it isn't working as required.<br> </p>
  
  <p>Expected:</p>
  
  <p>fileA:</p>
  
  <pre><code>1
  2
  3
  </code></pre>
  
  <p>fileB:</p>
  
  <pre><code>1
  2
  3
  </code></pre>
  
  <p>then fileC should have:</p>
  
  <pre><code>1 1
  2 2
  3 3
  </code></pre>