UNIX has many implementations and flavors, like the AT&T's System V, University of California - Berkeley's BSD, Santa Cruz Operations very own SCO, Novell's UnixWare, Sun's SunOS/Solaris, IBM's AIX, Hewlett-Packard HP-UX, SGI's IRIX, Compaq (DEC)'s Digital UNIX, Apple's Mac OS X and Linus Torvald's Linux just to name a few.

They all follow the UNIX standards POSIX (Portable Operating System Interface).

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by howe81