title: Shell - jq: Turning json list of `keys.childkeys` into list of lists
body: <p>I am using jq to parse a <code>json file</code>. This is the current output from <code>jq</code>:</p>
  <pre><code>[
   &quot;key1.childk2&quot;,
   &quot;key2.childk3&quot;
  ]
  </code></pre>
  <p>I would like to turn this into a readable json format itself as list of lists like below:</p>
  <pre><code>    [ 
        [&quot;key1&quot;,&quot;childk2&quot;],
        [&quot;key2&quot;,&quot;childk3&quot;]
      ]
  </code></pre>
  <p>I would ideally prefer to do this with <code>jq</code>, however any other shell tool that can work on shell variables is fair game.</p>