title: How to update Xcode from command line
body: <p>I am trying to update Xcode from the command line.  Initially I tried running:</p>
  
  <pre><code> xcode-select --install
  </code></pre>
  
  <p>which resulted in this message:</p>
  
  <pre><code>xcode-select: error: command line tools are already installed, use "Software Update" to install updates
  </code></pre>
  
  <p>So the question remains, is there a way to update Xcode from the command line? </p>