title: How to remove vim swap file warning
body: <p>After typed <code>vim ~/.ssh/config</code> in terminal, then got error message like picture1</p>
  
  <p><img src="https://i.stack.imgur.com/Y07ej.png" alt="picture1">
  <br>
  <br><strong>what I did for solving</strong>
  <br>
  1.push D in the screen to try to delete swap file.but it looks like pointless<br>
  <br>
  2.push r in the screen to confirm swap file.But I don't know how can I delete them.you can the condition in picture2.</p>
  
  <p><img src="https://i.stack.imgur.com/kxAXb.png" alt="picture2">
  please give me the tip how can I remove the error,</p>