title: Appium doctor shows error
body: <p>When I run Appium doctor it shows: </p>
  
  <pre><code>Running iOS Checks
  ✖ Unknown SW Version Command: Error: Command failed: /bin/sh -c sw_vers -productVersion
  /bin/sh: sw_vers: command not found
  Appium-Doctor detected problems. Please fix and rerun Appium-Doctor.
  </code></pre>
  
  <p>Can anyone help let me know what is the wrong here?</p>