title: What does #! operator mean in Linux?
body: <p>while following <a href="https://www.digitalocean.com/community/tutorials/how-to-set-up-automatic-deployment-with-git-with-a-vps" rel="nofollow noreferrer">this</a> tutorial I found a command </p>
  
  <pre><code>#!/bin/sh
  git --work-tree=/var/www/domain.com --git-dir=/var/repo/site.git checkout -f
  </code></pre>
  
  <p>I don't understand the meaning of #!/bin/sh. I tried to search it but google removes the ! symbol from search results.</p>
  
  <p><strong>What does <code>#!/bin/sh</code> mean here?</strong>
  Please help. </p>