title: Safe to run git gc
body: <p>I have encountered my first request to run git gc.  The message I received on my last commit was:</p>
  
  <pre><code>warning: There are too many unreachable loose objects; run 'git prune' to remove them.
  </code></pre>
  
  <p>and ...</p>
  
  <pre><code>You may also run "git gc" manually. See "git help gc" for more information.
  </code></pre>
  
  <p>So my question is do I run <code>git gc --aggressive</code>, <code>--auto</code> <code>--prune</code> or <code>--quiet</code>.</p>
  
  <p>Essentially I am concerned that I might lose any commit history or disrupt my master branch in any way?</p>
  
  <p>Any recommendations?</p>