title: What's the use of `-u` in `git push -u origin master`?
body: <blockquote>
    <p><strong>Possible Duplicate:</strong><br>
    <a href="https://stackoverflow.com/questions/5697750/what-exactly-does-the-u-do-git-push-u-origin-master-vs-git-push-origin-mas">What exactly does the &quot;u&quot; do? &quot;git push -u origin master&quot; vs &quot;git push origin master&quot;</a>  </p>
  </blockquote>
  
  
  
  <p>In Github, when you created an empty repository, the instructions ask you to execute</p>
  
  <pre><code>git push -u origin master
  </code></pre>
  
  <p>So my question is, what's the use of <code>-u</code> option?</p>
  
  <p>After reading the manpage  I still didn't get it.</p>