title: Difference between "@echo off" and "@echo %off"?
body: <p>At the beginning of a batch script, I saw the command:</p>
  
  <pre><code>@echo %off
  </code></pre>
  
  <p>To my surprise it has the same effect of:</p>
  
  <pre><code>@echo off
  </code></pre>
  
  <p>What is the effect of the '%' prefix?</p>