title: Replace dynamic generated string using sed
body: <p>I have a file that I would like to rename using sed. For simplicity purposes, this is what I am trying to do:</p>
  
  <pre><code>sh-4.3$ echo `date`
  Thu 17 Sep 08:29:50 EAT 2015
  sh-4.3$ echo `date` | sed 's/`date`/Today/'
  Thu 17 Sep 08:29:58 EAT 2015
  sh-4.3$ 
  </code></pre>
  
  <p>I expect it to echo "Today". What's the catch?</p>