title: Get efi return code in uefi mode
body: <p>I boot into uefi mode And I have a xxx.efi, I would like to get it's return code I write a startup.sh to launch the xxx.efi How could I get the xxx.efi return code? I try like this, but it will return unknow flag - '-para'</p>
  
  <pre><code>set code xxx.efi -para
  echo %code%
  </code></pre>
  
  <p>Someone could help this orz</p>