Command line required for download using the standard AWS
        command line interface.

def _cl_aws_cli(cls, file_info, region):
        """Command line required for download using the standard AWS
        command line interface.
        """
        s3file = cls._S3_FILE % {"bucket": file_info.bucket,
                                 "key": file_info.key,
                                 "region": ""}
        command = [os.path.join(os.path.dirname(sys.executable), "aws"),
                   "s3", "cp", "--region", region, s3file]
        return (command, "awscli")