title: iOS simulators boot, but don't appear, with "xcrun simctl boot ${UUID}"
body: <p>I run this script</p>
  
  <pre><code>#!/usr/bin/env bash
  
  device1="B13D4F22-AA4E-4890-8C2B-3C5B7B6E3678"
  device2="5E2588E9-38B5-48AF-99C5-DEE8A1E6FDA0"
  device3="2C28BD02-18BE-4FC5-94DE-075880E70E60"
  device4="723705CD-B038-44E0-B42E-F1D29A28E85E"
  
  xcrun simctl boot ${device1}
  xcrun simctl boot ${device2}
  xcrun simctl boot ${device3}
  xcrun simctl boot ${device4}
  </code></pre>
  
  <p>and the output is </p>
  
  <blockquote>
    <p>An error was encountered processing the command (domain=com.apple.CoreSimulator.SimError, code=164):
    Unable to boot device in current state: Booted
    An error was encountered processing the command (domain=com.apple.CoreSimulator.SimError, code=164):
    Unable to boot device in current state: Booted
    An error was encountered processing the command (domain=com.apple.CoreSimulator.SimError, code=164):
    Unable to boot device in current state: Booted
    An error was encountered processing the command (domain=com.apple.CoreSimulator.SimError, code=164):
    Unable to boot device in current state: Booted</p>
  </blockquote>
  
  <p>However, there is no "Xcode" icon in the dock, and I see no sims on the mac. How can they be booted? Why don't they appear?</p>