def do_du(self, params):
        """
\x1b[1mNAME\x1b[0m
        du - Total number of bytes under a path

\x1b[1mSYNOPSIS\x1b[0m
        du [path]

\x1b[1mOPTIONS\x1b[0m
        * path: the path (default: cwd)

\x1b[1mEXAMPLES\x1b[0m
        > du /
        90

        """
        self.show_output(pretty_bytes(self._zk.du(params.path)))