title: Standard format for yes/no questions in the terminal?
body: <p>Over the years I've seen many different ways of solving the problem of asking the user a simple yes/no question with a default value in the terminal.
  But in the interest of standardization, does any kind of standard for doing this exist ?</p>
  
  <p>Some of the different ways I've seen, plus a few examples dug up by googling include:</p>
  
  <pre><code>... (Y,N) [N]? Y
  ... (Y/N) ?  [Default=Y]
  ... [Y/n]?
  ... ([y]/n)?
  ...? [y/[n]]
  </code></pre>