title: Bash move * to subfolder fail: cannot move to a subdirectory of itself
body: <p>I have a folder with several files that I want to move to a subfolder:</p>
  
  <pre><code>mkdir subfolder
  mv ./* subfolder
  </code></pre>
  
  <p>But when I do this, I get: </p>
  
  <p><code>mv: cannot move 'subfolder' to a subdirectory of itself</code></p>
  
  <p>How can I simply avoid this?</p>