Executes whole process of parsing and running command.

def execute(self):
        """
        Executes whole process of parsing and running command.
        """
        self.autocomplete()
        if len(self.argv):
            cmd = self.argv[0]
            cmd_argv = self.get_argv_for_command()
            self.run_command(cmd, cmd_argv)
        else:
            self.show_help()