gistfile1.txt

<?php
/**
 * @file aliases.drushrc.php
 */

$aliases['drupal8'] = array(
  'uri' => 'drupalimp.localhost',
  'root' => '/path/to/project/drupal8',
);

// Now you can use the command `drush use @drupal8` to set the site.
// Or you can preface the drush command like `drush @drupal8 [command]`