title: GNU parallel arguments
body: <p>From the example </p>
  
  <pre><code>seq 1 100 | parallel -I @@ \ &gt; 'mkdir top-@@;seq 1 100 | parallel -X mkdir top-@@/sub-{}
  </code></pre>
  
  <p>How do <code>-X , @@, {}</code> work? Also, what will be the behavior when '1' or '.' is passed inside {}? Is /> used for redirection here?</p>
  
  <p>I was trying to go through the tutorial from <a href="https://www.youtube.com/watch?v=P40akGWJ_gY&amp;list=PL284C9FF2488BC6D1&amp;index=2" rel="nofollow noreferrer">https://www.youtube.com/watch?v=P40akGWJ_gY&amp;list=PL284C9FF2488BC6D1&amp;index=2</a> and reading through man parallel page. I am able to gather some basic knowledge but not exactly how to use it or as such.</p>