title: :wq! command in vim
body: <p>Recently, I read <a href="https://stackoverflow.com/questions/11828270/how-to-exit-the-vim-editor/11828573?s=1%7C389.0340#11828573" title="here">here</a> about the <code>:wq!</code> command in vim. I don't understand how it can force-write a file without write permissions. This way, theoretically, one would be able to edit root files without permission. Shouldn't it be disallowed? Or does it write into a new file?
  I saw a <a href="https://stackoverflow.com/questions/49050247/what-happens-when-i-enter-wq-in-vim">similar question</a>, but that is about motions and is very different.</p>
  
  <p>P.S. I haven't tried the command for fear of messing up system files.</p>