title: Unsetting persistent system properties
body: <p>I can set a persistent system property on an Android phone (with appropriate permissions) using <code>setprop &lt;key&gt; &lt;value&gt;</code> command:</p>
  
  <pre><code>$ adb shell setprop persist.this.is.my.property testing
  </code></pre>
  
  <p>I can then confirm that the property was set:</p>
  
  <pre><code>$ adb shell getprop persist.this.is.my.property
  testing
  </code></pre>
  
  <p>But I can't remove the key now that it is set (because of the persist at the start of the key it is there after the phone reboots). There is no unsetprop or rmprop or anything similar. Attempting to set the value to nil or null sets that to the value and leaving it empty prompts the help instructions.</p>
  
  <p>Does anyone know how to unset a system property from the command line after it has been set? </p>