Editing A/UX (section)

{{short description|Computer operating system}}
{{Use mdy dates|date=October 2017}}
{{Infobox OS
| name                   = A/UX
| screenshot             = Apple Unix with Netscape.png
| caption                = A/UX 3.0.1 with Finder, CommandShell, and Netscape
| developer              = [[Apple Inc.|Apple Computer]]
| family                 = {{Flat list|
*[[Mac operating systems|Macintosh]]
*[[UNIX System V]]
}}
| source_model           = [[Closed source]]
| released               = {{Start date and age|1988|02}}<ref name="A/UX ships following lengthy delay">{{cite magazine |magazine=[[Computerworld]] |title=A/UX ships following lengthy delay |first=Julie |last=Pitta |date=February 15, 1988 |page=133|url=https://books.google.com/books?id=TFES14SaHgMC&pg=PT132| volume=XXII| issue=7}}</ref>
| latest_release_version = 3.1.1
| latest_release_date    = {{Start date and age|1995}}
| kernel_type            = [[Monolithic kernel]]
| license                = [[Proprietary software|Proprietary]]
| working_state          = Historic
| website                = 
}}

'''A/UX''' is a [[Unix]]-based [[operating system]] from [[Apple Inc.|Apple Computer]] for [[Mac (computer)|Macintosh]] computers, integrated with [[System 7]]'s graphical interface and application compatibility. It is Apple's first official Unix-based operating system, launched in 1988 and discontinued in 1995 with version 3.1.1.<ref>{{cite magazine|magazine=[[InfoWorld]]|url=https://books.google.com/books?id=Cj8EAAAAMBAJ&q=%22apple%27s+first%22+infoworld+unix+%22a%2Fux%22&pg=PA31|date=March 7, 1988|title=Universities High on A/UX But Want More|first=Laurie|last=Flynn|page=31| volume=10| issue=10| access-date=June 19, 2017}}</ref> A/UX requires select [[Motorola 68000 series|68k]]-based Macintosh models with an [[Floating point unit|FPU]] and a paged [[memory management unit]] (PMMU).

Its foundation is [[UNIX System V]] Release 2.2, with features from Releases 3 and 4{{citation needed|date=February 2023}} and from [[Berkeley Software Distribution|BSD]] versions 4.2 and 4.3. It is compliant with [[POSIX]] and [[System V Interface Definition]] (SVID), and includes [[TCP/IP]] [[computer network|networking]] since version 2. Having a Unix-compatible, POSIX-compliant operating system enabled Apple to bid for large contracts to supply computers to the U.S. federal government.<ref name="Uncle Sam">{{cite magazine |title=Uncle Sam Salutes the Mac |first=Mitch |last=Betts |magazine=[[Computerworld]] |date=August 8, 1988 |url=https://books.google.com/books?id=rEilRN4XgNgC&pg=PT60| volume=XXII| issue=32| page=60}}</ref><ref name="Apple keen on Unix future">{{cite magazine |first=Alan J. |last=Ryan |magazine=[[Computerworld]] |date=August 15, 1988 |url=https://books.google.com/books?id=JAhNjLho9-sC&pg=PP6 |title=Apple keen on Unix future| volume=XXII| issue=33| page=6}}</ref>

A/UX was described by ''[[MacUser]]'' as "the most interesting and impressive software to have come out of Apple since [[HyperCard]]" and by ''[[InfoWorld]]'' as "an open systems solution with the Macintosh at its heart".<ref name="InfoWorld August 1992"/>