title: Replace whole line containing a string using Sed
body: <p>I have a text file which has a particular line something like</p>
  
  <pre><code>sometext sometext sometext TEXT_TO_BE_REPLACED sometext sometext sometext
  </code></pre>
  
  <p>I need to replace the whole line above with </p>
  
  <pre><code>This line is removed by the admin.
  </code></pre>
  
  <p>The search keyword is <code>TEXT_TO_BE_REPLACED</code> </p>
  
  <p>I need to write a shell script for this. How can I achieve this using <code>sed</code>?</p>