title: git push single file to a remote tracking branch
body: <p>Folks,</p>
  
  <p>This is my use case: I have 3 branches, all three are remote tracking branches. </p>
  
  <pre><code>git branch
    release-alpha
  * release-allUS
    master
  </code></pre>
  
  <p>Now I added a new file in release-allUS branch, I made a commit by doing this:</p>
  
  <pre><code> git add filter_driver.rb 
   git commit -m "driver code"
  </code></pre>
  
  <p>Now I want to push only this file to the remote release-allUS branch, How do I do that? Thanks a lot for any feedback.</p>