<operating system> The version of Unix running on Hewlett-Packard workstations.
HP-UX conforms to X/Open's Portability Guide Issue 4 (XPG4), Federal Information Processing Specification (FIPS) 151.1, POSIX 1003.1, POSIX 1003.2, AT&T's System V Interface Definition 2 (SVID 2).
HP-UX incorporates selected features from the University of California at Berkeley Software Distribution 4.3 (4.3BSD).
It is known by some as "HP-SUX".
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