AIX is based on UNIX System V with 4. 3BSD-compatible extensions.

In developing AIX, IBM and Interactive Systems Corporation ( whom IBM contracted ) also incorporated source code from 4. 2 and 4. 3 BSD UNIX.

AIX Version 4, introduced in 1994, added symmetric multiprocessing with the introduction of the first RS / 6000 SMP servers and continued to evolve through the 1990s, culminating with AIX 4. 3. 3 in 1999.

In 2003, the SCO Group alleged that ( among other infractions ) IBM had misappropriated licensed source code from UNIX System V Release 4 for incorporation into AIX ; SCO subsequently withdrew IBM's license to develop and distribute AIX.

AIX / 370 was released in 1990 with functional equivalence to System V Release 2 and 4. 3BSD as well as IBM enhancements.

* AIX 4. 3. 3, September 17, 1999

* AIX 4. 3. 1, April 24, 1998

* AIX 4. 3, October 31, 1997

* AIX 4. 2. 1, April 25, 1997

* AIX 4. 2, May 17, 1996

* AIX 4. 1. 5, November 8, 1996

* AIX 4. 1. 4, October 20, 1995

* AIX 4. 1. 3, July 7, 1995

* AIX 4. 1. 1, October 28, 1994

* AIX 4. 1, August 12, 1994

* AIX 4. 0, 1994

The default shell was Bourne shell up to AIX version 3, but was changed to Korn shell ( ksh88 ) in version 4 in view of XPG4 and POSIX compliance.

The original KornShell, < tt > ksh88 </ tt >, is the default shell on AIX since version 4. with ksh93 available separately.

AIX ( Advanced Interactive eXecutive, pronounced ) is a series of proprietary Unix operating systems developed and sold by IBM for several of its computer platforms.

Originally released for the IBM 6150 RISC workstation, AIX now supports or has supported a wide variety of hardware platforms, including the IBM RS / 6000 series and later IBM POWER and PowerPC-based systems, IBM System i, System / 370 mainframes, PS / 2 personal computers, and the Apple Network Server.

The AIX family of operating systems debuted in 1986, became the standard operating system for the RS / 6000 series on its launch in 1990, and is still actively developed by IBM.

AIX was the first operating system to utilize journaling file systems, and IBM has continuously enhanced the software with features like processor, disk and network virtualization, dynamic hardware resource allocation ( including fractional processor units ), and reliability engineering ported from its mainframe designs.

AIX Version 1, introduced in 1986 for the IBM 6150 RT workstation, was based on UNIX System V Releases 1 and 2.

Among other variants, IBM later produced AIX Version 3 ( also known as AIX / 6000 ), based on System V Release 3, for their IBM POWER-based RS / 6000 platform.

In the late 1990s, under Project Monterey, IBM and the Santa Cruz Operation planned to integrate AIX and UnixWare into a single 32-bit / 64-bit multiplatform UNIX with particular emphasis on running on Intel IA-64 ( Itanium ) architecture CPUs.

A beta test version of AIX 5L for IA-64 systems was released, but according to documents released in the SCO v. IBM lawsuit, less than forty licenses for the finished Monterey Unix were ever sold before the project was terminated in 2002.

AIX was a component of the 2003 SCO v. IBM lawsuit, in which the SCO Group filed a lawsuit against IBM, alleging IBM contributed SCO's intellectual property to the Linux codebase.

* AIX 3. 2 1992

* AIX 3. 1, February 1990

* AIX 3. 0 1989

* AIX version 5. 3 Documentation

Commercial Unix vendors, such as Sun, HP, DEC, and IBM each received copies of the vi source, and their operating systems, Solaris, HP-UX, Tru64, and AIX, today continue to maintain versions of vi directly descended from the 3. 7 release, but with added features, such as adjustable key mappings, encryption, and wide character support.

IBM introduced JFS with the initial release of AIX version 3. 1 in February, 1990.

The 800-series can run Windows NT 3. 5 ( probably 4. 0 as well ), OS / 2, AIX 4. 14, Solaris Desktop 2. 5. 1 PowerPC Edition, and Linux.

* AIX 3. 2. 3 or later

The ability to run older versions of AIX as a WPAR keeps the opportunity to continue using 5. 2 where the hardware doesn't support it.

AIX PS / 2 running on Virtual PC

AIX PS / 2 ( also known as AIX / 386 ) was developed by Locus Computing Corporation under contract to IBM.

AIX PS / 2, first released in 1989, ran on IBM PS / 2 personal computers with Intel 386 and compatible processors.

* AIX PS / 2 v1. 1, 1989

MySQL works on many different system platforms, including AIX, BSDi, FreeBSD, HP-UX, eComStation, i5 / OS, IRIX, Linux, Mac OS X, Microsoft Windows, NetBSD, Novell NetWare, OpenBSD, OpenSolaris, OS / 2 Warp, QNX, Solaris, Symbian, SunOS, SCO OpenServer, SCO UnixWare, Sanos and Tru64.

This was an entirely new product, not a port of the existing OS / 2, that borrowed certain sections of code from both the existing OS / 2 and AIX products while using an entirely new microkernel code base and adding major features including a system registry and a new driver model.

Samba runs on most Unix and Unix-like systems, such as GNU / Linux, Solaris, AIX and the BSD variants, including Apple's Mac OS X Server ( which was added to the Mac OS X client in version 10. 2 ).

* IBM System Object Model SOM and DSOM — component systems from IBM used in OS / 2 and AIX

Gecko is written in C ++ and is cross-platform, and runs on various operating systems including BSDs, Linux, Mac OS X, Solaris, OS / 2, AIX, OpenVMS, and Microsoft Windows.

There are versions for AIX, eComStation, OS / 2 and Linux operating systems.

This would create easy migration paths between OS / 2, AIX, Mac OS, and Pink by allowing any combination of operating system personalities to run simultaneously on a single computer.

It ran on top of AIX, HP-UX, OS / 2, Windows NT, and a new Apple OS kernel called NuKernel.

The first versions of CommonPoint shipped for AIX and OS / 2 in mid-1995, but were met with a lukewarm response in terms of sales.