HP-UX
| HP-UX | |
|---|---|
Screenshot and CDE graphical interface of HP-UX version 11iv3 | |
| Developer | Hewlett Packard Enterprise |
| Written in | C |
| OS family | Unix (System V) |
| Working state | Discontinued |
| Source model | Closed source |
| Initial release | 1982 |
| Latest release | 2505.11iv3 / May 22, 2025 |
| Marketing target | Server |
| Available in | English |
| Package manager | Software Distributor |
| Supported platforms | Motorola 68k, FOCUS, PA-RISC, IA-64 |
| Kernel type | Monolithic with dynamically loadable modules |
| Userland | POSIX / SUS |
| Default user interface | KDE Plasma, GNOME and CDE |
| License | Proprietary |
| Official website | Integrity Servers with HP-UX for Mission Critical UNIX at the Wayback Machine (archived 2023-05-15) |
HP-UX (from "Hewlett Packard Unix") is a discontinued proprietary implementation of the Unix operating system developed by Hewlett Packard Enterprise, now out of standard support (Mature Support on HPE Integrity without Sustaining Engineering through at least 2028); the final versions support HPE Integrity Servers, based on Intel's Itanium architecture. It is based on Unix System V (initially System III) and first released in 1984.
Earlier versions of HP-UX supported the HP Integral PC and HP 9000 Series 200, 300, and 400 computer systems based on the Motorola 68000 series of processors, the HP 9000 Series 500 computers based on HP's proprietary FOCUS architecture, and later HP 9000 Series models based on HP's PA-RISC instruction set architecture. HP-UX was the first Unix to offer access-control lists for file access permissions as an alternative to the standard Unix permissions system. HP-UX was also among the first Unix systems to include a built-in logical volume manager.
Following the discontinuation of Itanium processors, support for HP-UX ended on December 31, 2025. HP-UX 11i remains certified to The Open Group's UNIX 03 standard. Previous releases were certified to the UNIX 95 standard.