title: Getting error (gpg: can't open '–': No such file or directory)while adding docker GPG key
body: <p>While setup docker repository when I adding docker GPG key</p>
  <p>cmd- curl -fsSL <a href="https://download.docker.com/linux/ubuntu/gpg" rel="nofollow noreferrer">https://download.docker.com/linux/ubuntu/gpg</a> | sudo apt-key add –</p>
  <p>Getting error (gpg: can't open '–': No such file or directory)</p>
  <p><a href="https://i.stack.imgur.com/akA0M.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/akA0M.png" alt="error" /></a></p>