Transfert status file is mandatory for unifyfs-stage?

[wangvsa]

UnifyFS/util/unifyfs-stage/src/unifyfs-stage.c

Lines 211 to 214 in 1657721

	if (NULL == status_file) {
	/* status_file is required for transfer status file */
	return EINVAL;
	}

If I understand correctly, the status file is not required to use unifyfs-stage. But the code checks whether -S (path to status file) is there, if not it will print out the help message and exit. However, neither the help message and the document says -S is mandatory to use unifyfs-stage.