HP-UX

HP-UX – (Hewlett-Packard) conforms to X/Open’s Portability Guide Issue 4 (XPG4), Federal Information Processing Specification (FIPS) 151.1, POSIX 1003.1, and POSIX 1003.2. It conforms to AT&T;’s System V Interface Definition 2 (SVID 2). HP-UX also incorporates selected features from the University of California at Berkeley Software Distribution 4.3 (4.3BSD).