public function isBltAliasInstalled() {
    $cli_config_file = $this->getCliConfigFile();
    if (!is_null($cli_config_file) && file_exists($cli_config_file)) {
      $contents = file_get_contents($cli_config_file);
      if (strstr($contents, 'function blt')) {
        return TRUE;
      }
    }

    return FALSE;
  }