title: GPG key exists in the list?
body: <p>I want to create a shell script and I haven't worked with it before. 
  There is a command for gpg:</p>
  
  <pre><code>gpg --keyserver SERVER --recv-keys  KEY
  </code></pre>
  
  <p>The problem is that I don't want to run this command if key has been already added. Is there any method to check that key exists in keys list?
  Thank you!</p>