title: Git automatic merge commit message
body: <p>I have split one giant repo into several small ones.  The old repo is still being comited to so I have to keep updating my new smaller ones. </p>
  
  <p>I did this by doing this:</p>
  
  <pre><code>git subtree split -P some-sub-directory-in-my-large-repo/ -b branch-name-I-split
  </code></pre>
  
  <p>Obviously,  I am trying to script this out, but I can't get past this:</p>
  
  <pre><code>cd my-smaller-repo
  git pull /path-to-large-repo/ branch-name-I-split
  </code></pre>
  
  <p>And that of course brings me to the editor.</p>
  
  <p>I need to just accept the default message and move on...</p>
  
  <p>Any ideas?</p>