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.

GNU, 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 being sued. But they are by no means clones.

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