title: Replacing a string on 2 lines
body: <p>I would like to edit a file on the command line.
  I need to modify a set of 2 lines in this file.</p>
  
  <p>Here are the 2 lines:</p>
  
  <pre><code>&lt;parameter name="mail.smtp.from"&gt;synapse.demo.0@gmail.com&lt;/parameter&gt;
      &lt;/transportSender&gt;--&gt;
  </code></pre>
  
  <p>Here is the result I would like to have:</p>
  
  <pre><code>&lt;parameter name="mail.smtp.from"&gt;synapse.demo.0@gmail.com&lt;/parameter&gt;
      &lt;/transportSender&gt;
  </code></pre>