Actually, this is an incorrect term. While Linux is in fact a clone, BSD and SunOS are not, because they contain code derived from the original AT&T UNIX.
, Linux, and Minix
are UNIX clones. Everything else I can think of are not. Though legally
, many are not UNIX
, because of The UNIX Trademark
. Thus, the best term is probably "UNIX-like operating system
", to avoid
. But they are by no means clones.