title: How to reverse column order of a file in Linux from the command line
body: <p>I have a file named <code>ip-list</code> with two columns:</p>
  
  <pre><code>IP1  &lt;TAB&gt;  Server1
  IP2  &lt;TAB&gt;  Server2
  </code></pre>
  
  <p>And I want to produce:</p>
  
  <pre><code>Server1  &lt;TAB&gt;  IP1
  Server2  &lt;TAB&gt;  IP2
  </code></pre>
  
  <p>What's the most elegant, shortest Linux command line tool to do it?</p>