protected function runSSH($command, $server = null)
    {
        $server = $server ? $server : $this->hostNameForConfigFile();
        $ssh_config_file = $_SERVER['HOME'] . '/.ssh/config';
        $full_command = "ssh -F $ssh_config_file -t $server '$command'";
        $this->info($full_command);
        passthru($full_command);
    }