title: Shell script multi-line comment
body: <p>I am having a large shell script file.  At times while doing modification I want to comment out part of it.  But commenting line as shown in the below example is giving me error.</p>
  
  <p>Script:</p>
  
  <pre><code>#!/bin/bash
  &lt;&lt;COMMENT1
  read build_label
  read build_branch_tag
  build_date_tag=$(echo $build_label | sed "s/$build_branch_tag//g")
  echo $build_path
  COMMENT1
  echo "HELLO WORLD"
  </code></pre>
  
  <p>Error Message:</p>
  
  <blockquote>
    <p>sed: first RE may not be empty</p>
  </blockquote>
  
  <p>I just want to understand what's wrong with the above script and why comment section is not working properly.  </p>