title: How to see the file's encoding in emacs?
body: <p>I don't find the encoding of current file, how to display it?</p>
  
  <p><img src="https://i.stack.imgur.com/BKmcD.png" alt="emacs"></p>
  
  <p>You can see there are some Chinese characters in the file, but I don't know what the encoding it is.</p>
  
  <p>Is there any way to let it always show on the emacs GUI?</p>