title: Docker [ENTER] flag
body: <p>I am currently writing a Dockerfile, and I one of the commands I want to execute requires the user to press [ENTER], for example:</p>
  
  <pre><code>Press [ENTER] to continue or Ctrl-c to cancel adding it.
  </code></pre>
  
  <p>I know that on some commands when it requires a <code>[Y/n]</code> the <code>-y</code> flag will suffice; however, in some commands such as this one, it requires a physical key press. Therefore, I would like you to please help me solve this issue. </p>
  
  <p>How does one send a [ENTER] key press as a flag in a Dockerfile?</p>