title: Git push all updates from one repo to another
body: <p>I have forked project X on Github, and it is checked out on my machine.</p>
  
  <p>I have cloned my github project, and I have two remotes: origin (my fork) 
  and parent (parent repo).</p>
  
  <p>I will be adding new branches to origin, but not touching existing branches
  forked from parent.</p>
  
  <p>I have a cron job that runs nightly; I would like to fetch all changes from parent
  and push all changes to origin, so that I keep up to date with parent.</p>
  
  <p>Currently, I run</p>
  
  <pre><code>git fetch --all
  git push --all
  </code></pre>
  
  <p>Will this be sufficient to do what I am trying to do?</p>