title: How to change encoding of files in batch
body: <p>I have tons of files encoded in Japanese (Shift JIS) and I have to change the encoding of them to UTF-8</p>
  
  <p>With VSCode, or some other editors such as Sublime, Emacs, I can open those files with encoding Shift JIS and then save them with encoding UTF-8. </p>
  
  <p>How to change encoding of all files under a folder, including subfolders?</p>