def locale(self):
        """The locale the server is running on.

        Returns:
            str: the locale of the remote server if detected, or `None`.
        """
        if self.platform in ("linux", "darwin", "freebsd"):
            locale = self._exec_command('echo $LANG')
            if locale is not None:
                return locale.split(b'.')[-1].decode('ascii').lower()
        return None