Allows regular drush commands without -l arg when using super awesome dynamic vhost

settings.php

<?php
/**
 * Allow developers to override settings.
 */
define('SWEET_ASS_LIVE_SETTINGS_REGEX', '/^(.*)drupalcampaustin.org(:\d+)*$/');
define('SWEET_ASS_STAGE_SETTINGS_REGEX', '/^(dca11\.webchefs\.org|dca11\.dev1\.fourkitchens\.com)(:\d+)*$/');

if (preg_match(SWEET_ASS_LIVE_SETTINGS_REGEX, $_SERVER['HTTP_HOST'], $matches)) {
  if (file_exists('sites/default/settings.live.php')) {
    include_once 'sites/default/settings.live.php';
  }
}
elseif (preg_match(SWEET_ASS_STAGE_SETTINGS_REGEX, $_SERVER['HTTP_HOST'])) {
  if (file_exists('sites/default/settings.stage.php')) {
    include_once 'sites/default/settings.stage.php';
  }
}
else {
  // Load general dev settings.
  if (file_exists('sites/default/settings.dev.php')) {
    include_once 'sites/default/settings.dev.php';
  }
  // Load user settings.
  if (file_exists('sites/default/settings_' . getenv(USER) . '.php')) {
    include_once 'sites/default/settings_' . getenv(USER) . '.php';
  }
}