A/UX

A/UX is Apple Computer's implementation of the Unix operating system for some of their Macintosh computers, the latest versions running on the Mac II, Quadra and Centris series of machines.

The system is based on System V.2.2 with features of V.3 and V.4 and BSD 4.2 and 4.3. It is POSIX and System V Interface Definition[?] (SVID) compliant.

A/UX has the Macintosh operating system Mac OS version 7.0.1 running on top of it, so the user is virtually using a normal Macintosh, with the familiar Finder graphical user interface and applications. An X Window System server application or a terminal program may be used to interface with the underlying Unix-system. Alternatively the user may choose to run a full X11R4 session, without the Finder.