The string used in a .<ROOT>_config file section.  Usually this
        is just the full prog name for a command minus the root command.

def config_section(self):
        """ The string used in a .<ROOT>_config file section.  Usually this
        is just the full prog name for a command minus the root command. """
        names = []
        cmd = self
        while cmd.parent:
            names.append(cmd.name)
            cmd = cmd.parent
        if not names:
            return self.name
        else:
            return ' '.join(reversed(names))