title: Recursively cat all the files into single file
body: <p>I have bunch of files sitting in folders like</p>
  
  <pre><code>data\A\A\A\json1.json
  data\A\A\A\json2.json
  data\A\A\B\json1.json
  ...
  data\Z\Z\Z\json_x.json
  </code></pre>
  
  <p>I want to cat all the jsons into one single file?</p>