def wait(self, options=[], sub_job_num=None):
        """Wait for the job, or a sub-job to complete.

        Args:
            options (list of str, optional): A list of command line options for the condor_wait command. For
                details on valid options see: http://research.cs.wisc.edu/htcondor/manual/current/condor_wait.html.
                Defaults to an empty list.
            job_num (int, optional): The number
        """
        args = ['condor_wait']
        args.extend(options)
        job_id = '%s.%s' % (self.cluster_id, sub_job_num) if sub_job_num else str(self.cluster_id)
        if self._remote:
            abs_log_file = self.log_file
        else:
            abs_log_file = os.path.abspath(self.log_file)
        args.extend([abs_log_file, job_id])
        out, err = self._execute(args)
        return out, err