Editing Single UNIX Specification (section)

==Compliance==

{| class="wikitable sortable"
! Product
! Vendor
! Architecture
! UNIX V7<ref name="UNIX_V7"/>
! UNIX 03<ref name="UNIX_03"/>
! UNIX 98<ref name="UNIX_98"/>
! UNIX 95<ref name="UNIX_95"/>
! UNIX 93<ref name="UNIX_93"/>
|-
| [[IBM AIX|AIX]]
| [[IBM Corporation]]
| [[Power_ISA|POWER processors]]
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
| {{no}}
|-
| [[HP-UX]]
| [[Hewlett Packard Enterprise]]
| [[IA-64]], [[PA-RISC]]
| {{no}}
| {{yes}}
| {{no}}
| {{no}}
| {{no}}
|-
| [[macOS]]
| [[Apple Inc.|Apple]]
| [[x86-64]], [[ARM64]]
| {{no}}
| {{yes}}
| {{no}}
| {{no}}
| {{no}}
|-
| [[SCO OpenServer|OpenServer]]
| [[Xinuos]]
| [[IA-32]]
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{yes}}
|-
| [[UnixWare]]
| [[Xinuos]]
| [[IA-32]]
| {{no}}
| {{no}}
| {{no}}
| {{yes}}
| {{no}}
|-
| [[z/OS]]
| [[IBM Corporation]]
| [[z/Architecture]]
| {{no}}
| {{no}}
| {{no}}
| {{yes}}
| {{no}}
|}

===Currently registered UNIX systems===

====AIX====
[[IBM AIX|AIX]] version 7, at either 7.1 TL5 (or later) or 7.2 TL2 (or later) are registered as UNIX 03 compliant.<ref>{{cite web|author=The Open Group|title=UNIX 03, AIX|url=https://www.opengroup.org/openbrand/register/brand3637.htm}}</ref> AIX version 7, at 7.2 TL5 (or later) are registered as UNIX V7 compliant.<ref>{{cite web|author=The Open Group|title=UNIX V7, AIX|url=https://www.opengroup.org/openbrand/register/brand3658.htm}}</ref> Older versions were previously certified to the UNIX 95 and UNIX 98 marks.<ref name="2003-register">{{cite web|archive-url=https://web.archive.org/web/20030802103246/http://www.opengroup.org/openbrand/register/|url=http://www.opengroup.org/openbrand/register/|title=The Open Brand - Register of Certified Products|date=July 23, 2003|archive-date=August 2, 2003|access-date=January 23, 2022|website=Open Group}}</ref>

====HP-UX====
[[HP-UX]] 11i V3 Release B.11.31 is registered as UNIX 03 compliant. Previous releases were registered as UNIX 95.<ref>{{cite web|url=http://h21007.www2.hp.com/portal/download/files/unprot/STK/HPUX_STK/impacts/i1071.html|title=UNIX 2003 Standard Profile conformance|access-date=July 22, 2014|publisher=[[Hewlett-Packard]]|archive-url=https://web.archive.org/web/20140727044600/http://h21007.www2.hp.com/portal/download/files/unprot/STK/HPUX_STK/impacts/i1071.html|archive-date=July 27, 2014}}</ref>

====macOS====
[[Apple Inc.|Apple]] [[macOS]] (formerly known as Mac OS X and OS X) is registered as UNIX 03 compliant.<ref>{{cite web|url=https://images.apple.com/macosx/docs/OSX_for_UNIX_Users_TB_July2011.pdf|title=OS X for UNIX Users|date=July 2011}}</ref> The first version registered was [[Mac OS X Leopard|Mac OS X 10.5 Leopard]], certified on October 26, 2007 (on x86 systems).<ref>{{cite web|publisher=Apple Inc.|title=Mac OS X Leopard - Technology - UNIX|url=https://www.apple.com/macosx/leopard/technology/unix.html |work=Leopard Technology Overview|access-date=June 11, 2007|quote=Leopard is now an Open Brand UNIX 03 Registered Product, conforming to the SUSv3 and POSIX 1003.1 specifications for the C API, Shell Utilities, and Threads. |archive-url = https://web.archive.org/web/20070823040630/http://www.apple.com/macosx/leopard/technology/unix.html <!-- Bot retrieved archive --> |archive-date = August 23, 2007}}</ref><ref>{{cite web|author=The Open Group|title=Mac OS X Version 10.5 Leopard on Intel-based Macintosh computers certification|url=https://www.opengroup.org/openbrand/register/brand3555.htm|access-date=June 12, 2007}}</ref> All versions of [[macOS]] from Mac OS X Leopard to [[macOS Catalina|macOS 10.15 Catalina]], except for [[Mac OS X Lion|OS X Lion]],<ref>{{Cite web |title=Re: was OS X version 10.7 Lion UNIX 03 certified? |url=https://www.mail-archive.com/austin-group-l@opengroup.org/msg02006.html |access-date=2021-07-22 |website=www.mail-archive.com |archive-date=April 29, 2020 |archive-url=https://web.archive.org/web/20200429213555/https://www.mail-archive.com/austin-group-l@opengroup.org/msg02006.html |url-status=live }}</ref> have been registered on Intel-based systems, and all versions from [[macOS Big Sur|macOS 11 Big Sur]], the successor to macOS Catalina, up to [[MacOS Sequoia|macOS 15 Sequoia]] have been registered on both x86-64 and ARM64 systems.<ref>{{cite web |title=Open Brand |url=https://www.opengroup.org/openbrand/register/apple.htm |access-date=2025-05-18 |website=www.opengroup.org}}</ref>

====Xinuos====
[[UnixWare]] 7.1.3 and later is registered as UNIX 95 compliant.
[[OpenServer]] 5 and 6 are registered as UNIX 93 compliant.

====z/OS====
IBM [[z/OS]] 1.2 and higher is registered as UNIX 95 compliant.
z/OS 1.9, released on September 28, 2007, and subsequent releases "better align" with UNIX 03.<ref>{{cite book
  | url = https://www.redbooks.ibm.com/redbooks/pdfs/sg247427.pdf
  | title = z/OS Version 1 Release 9 Implementation
  | access-date = June 9, 2024
  | date = December 2007
  | pages = 4-5,156-162
  | publisher = IBM
  | id = SG24-7427-00
  | edition = First
}}</ref>

===Previously registered UNIX systems===

====EulerOS====
[[EulerOS]] 2.0 for the [[x86-64]] architecture was registered as UNIX&nbsp;03 compliant.<ref>{{cite press release|url=https://www.huawei.com/en/news/2016/9/huawei-kunlun-euleros-unix-certification|title=Huawei KunLun EulerOS 2.0 Operating System Passes UNIX Certification|date=September 9, 2016|access-date=October 29, 2016|publisher=[[Huawei]]}}</ref><ref name="euler-cert">{{cite web|author=The Open Group|title=UNIX 03, EulerOS|url=https://www.opengroup.org/openbrand/register/brand3622.htm}}</ref> The UNIX&nbsp;03 conformance statement shows that the standard C compiler is from the [[GNU Compiler Collection]] ({{mono|gcc}}), and that the system is a [[Linux distribution]] of the [[Red Hat Enterprise Linux]] family.<ref name="EulerOS_conformance_commands">{{cite web| url=https://www.opengroup.org/csq/repository/norationale=1&noreferences=1&RID=huawei%252FCX1%252F1.html| title=Huawei Conformance Statement: Commands and Utilities V4| author=Peng Shen| publisher=The Open Group| access-date=October 29, 2016}}</ref> The UNIX 03 certification expired in September 2022 and has not been renewed.<ref name="euler-cert" />

====FTX====
[[Stratus Technologies]] DNCP Series servers running FTX Release 3 were registered as UNIX 93 compliant.<ref>{{cite web|author=The Open Group|title=The Open Brand - Register of Certified Products - UNIX 93|url=https://www.opengroup.org/openbrand/register/xt.htm|archive-url=https://web.archive.org/web/20161005132055/https://www.opengroup.org/openbrand/register/xt.htm|archive-date=October 5, 2016}}</ref>

====Inspur K-UX====
[[Inspur K-UX]] 2.0 and 3.0 for the [[x86-64]] architecture were certified as UNIX&nbsp;03 compliant.<ref>{{cite web|url=https://www.opengroup.org/openbrand/register/brand3596.htm |title=The Open Brand Register of Certified Products|access-date=May 29, 2014|publisher=The Open Group|date=May 29, 2014}}</ref><ref name="inspur_conformance_statement">{{cite web| url=https://www.opengroup.org/csq/repository/RID=inspur%252FXY1%252F1.html| title=Inspur Conformance Statement| author=Xie Ruohong| publisher=The Open Group| access-date=December 8, 2015}}</ref> The UNIX&nbsp;03 conformance statement for Inspur K-UX 2.0 and 3.0 shows that the standard C compiler is from the [[GNU Compiler Collection]] ({{mono|gcc}}), and that the system is a [[Linux distribution]] of the [[Red Hat]] family.<ref name="inspur_conformance_commands">{{cite web| url=https://www.opengroup.org/csq/repository/RID=inspur%252FCX1%252F1.html| title=Inspur Conformance Statement: Commands and Utilities V4| author=Xie Ruohong| publisher=The Open Group| access-date=December 8, 2015}}</ref>

====IRIX====

[[Silicon Graphics|SGI]] [[IRIX]] 6.5 was registered as UNIX 95 compliant.<ref>{{cite web|url=http://www.opengroup.org/openbrand/register/xu013.htm|title=Silicon Graphics Inc - UNIX 95|website=Open Group|archive-date=2003-08-02|archive-url=https://web.archive.org/web/20030802154406/http://www.opengroup.org/openbrand/register/xu013.htm|url-status=dead}}</ref>

====OS/390====
IBM [[OS/390]] was registered as UNIX 95 compliant beginning with the V2R4 release.<ref>{{cite web|title=Register of Open Branded Products (OS/390)|archive-url=https://web.archive.org/web/20030629093915/http://www.opengroup.org/openbrand/register/xu009.htm|url=http://www.opengroup.org/openbrand/register/xu009.htm|archive-date=2003-06-29|date=2003-06-19|website=Open Group|url-status=dead}}</ref>

====Reliant UNIX====
The last [[Reliant UNIX]] versions were registered as UNIX 95 compliant (XPG4 hard branding).

====Solaris====
[[Solaris (operating system)|Solaris]] 11.4 was previously registered as UNIX v7 compliant in 2018.<ref>{{cite web|url=https://www.opengroup.org/openbrand/register/brand3642.htm|title=UNIX V7 - The Open Brand Register, Oracle Corporation|website=[[The Open Group]]|archive-url= https://web.archive.org/web/20200114100431/https://www.opengroup.org/openbrand/register/brand3642.htm|archive-date=January 14, 2020|access-date=January 16, 2021}}</ref> Solaris 11 and Solaris 10 were registered as UNIX 03 compliant on [[32-bit]] and [[64-bit]] [[x86]] ([[X86-64]]) and [[SPARC]] systems. Solaris 8 and 9 were registered as UNIX 98 compliant on [[32-bit]] [[x86]] and [[SPARC]] systems; 64-bit x86 systems were not supported. Solaris 2.4 and 2.6, on both x86 and SPARC, were certified to the UNIX 93 and UNIX 95 marks respectively.<ref name="2003-register" />

Solaris 2.5.1 was also registered as UNIX 95 compliant on the [[PReP]] [[PowerPC]] platform in 1996, but the product was withdrawn before more than a few dozen copies had been sold.<ref>{{cite web|url=http://www.ocf.berkeley.edu/solaris/versions/solaris/2.5.1.html|title=Solaris 2.5.1|archive-url=https://web.archive.org/web/20050912194850/http://www.ocf.berkeley.edu/solaris/versions/solaris/2.5.1.html|archive-date=September 12, 2005|url-status=dead}}</ref>

====Tru64 UNIX====
[[Tru64 UNIX]] V5.1A and later were registered as UNIX 98 compliant.<ref>{{cite web|url=http://www.opengroup.org/openbrand/register/xx001.htm|title=Compaq Computer Corporation - UNIX 95|website=Open Group|archive-date=2003-06-29|archive-url=https://web.archive.org/web/20030629103042/http://www.opengroup.org/openbrand/register/xx001.htm}}</ref>

====Other====
Other operating systems previously registered as UNIX 95 or UNIX 93 compliant:
*[[NCR Corporation|NCR]] UNIX SVR4
*[[NEC]] UX/4800

===Non-registered Unix-like systems===
Developers and vendors of [[Unix-like]] operating systems such as [[Linux]], [[FreeBSD]], and [[MINIX]] typically do not certify their distributions and do not install full POSIX utilities by default.

For Linux, [[pax (command)|pax]] command is usually not installed; furthermore, pax command packages available for Linux often lack pax file format support required by POSIX.<ref>{{cite web| url = https://bugs.launchpad.net/rpm/+bug/1329914| website = Ubuntu bug tracker| title = Bug #1329914 "No UNIX compatible pax implementation" : Bugs : RPM| date = June 13, 2014}}</ref> Sometimes, SUS compliance can be improved by installing additional packages, but very few Linux systems can be configured to be completely conformant. The [[Linux Standard Base]] was formed in 2001 as an attempt to standardize the internal structures of Linux-based systems for increased compatibility. It is based on the POSIX specifications, the Single UNIX Specification, and other open standards, and also extends them in several areas; but there are some conflicts between the LSB and the POSIX standards.<ref>{{cite ISO standard | csnumber=38825 | title=ISO/IEC TR 24715:2006 - Information technology -- Programming languages, their environments and system software interfaces -- Technical Report on the Conflicts between the ISO/IEC 9945 (POSIX) and the Linux Standard Base (ISO/IEC 23360) | access-date=October 15, 2011}}</ref><ref>{{cite web|url=https://personal.opengroup.org/~ajosey/tr20-08-2005.txt|title=Conflicts between ISO/IEC 9945 (POSIX) and the Linux Standard Base.|first=Andrew|last=Josey|type=Unapproved Draft|website=personal.opengroup.org|date=August 29, 2005}}</ref> Few [[Linux distribution]]s actually go through certification as LSB compliant.<ref>{{cite web| url=https://www.linuxbase.org/lsb-cert/productdir.php?by_lsb| title=Certified Products Product Directory| access-date=December 9, 2015| publisher=The Linux Foundation|archive-url=https://archive.today/20121220223126/https://www.linuxbase.org/lsb-cert/productdir.php?by_lsb|archive-date=December 20, 2012}}</ref>

[[Darwin (operating system)|Darwin]], the open source subset of macOS, has behavior that can be set to comply with UNIX&nbsp;03.<ref>{{Cite web|url=https://developer.apple.com/documentation/Darwin/Reference/Manpages/man5/compat.5.html|title=Mac OS X Manual Page for compat(5) - Mac OS X 10.3|date=October 23, 2005|website=developer.apple.com|archive-url=https://web.archive.org/web/20090310143649/http://developer.apple.com/documentation/Darwin/Reference/Manpages/man5/compat.5.html|archive-date=March 10, 2009|access-date=May 24, 2018}}</ref><ref>{{Cite web|url=https://developer.apple.com/legacy/library/documentation/Darwin/Reference/ManPages/man5/compat.5.html|title=compat(5) Manual Page - macOS 10.9|date=June 30, 2010|website=developer.apple.com|access-date=May 24, 2018}}</ref> Darwin uses a 4.4BSD-derived pax command,<ref>{{Cite web|url=https://developer.apple.com/documentation/Darwin/Reference/Manpages/man1/pax.1/html|title=Mac OS X Manual Page for pax(1) - Mac OS X 10.3|date=October 23, 2005|website=developer.apple.com|archive-url=https://web.archive.org/web/20090310143649/http://developer.apple.com/documentation/Darwin/Reference/Manpages/man1/pax.1.html|archive-date=March 10, 2009|access-date=November 25, 2023}}</ref> which lacks multibyte support for filenames.{{cn|date=November 2023}}

FreeBSD previously had a "C99 and POSIX Conformance Project" which aimed for compliance with a subset of the Single UNIX Specification, and documentation where there were differences.<ref>{{cite web|url=http://www.freebsd.org/projects/c99/|title=FreeBSD C99 and POSIX conformance project|publisher=FreeBSD Project|archive-url=https://web.archive.org/web/20131223025351/http://www.freebsd.org/projects/c99/|archive-date=December 23, 2013|url-status=dead}}</ref> FreeBSD pax command, derived from 4.4BSD, does not fully support pax file format.<ref>{{man|1|pax|FreeBSD}}</ref> pax and ustar in-archive format use the same with slightly different defaults (5120 block size vs 10240 block size);<ref>{{cite web|url=https://pubs.opengroup.org/onlinepubs/9699919799/|title=pax - portable archive interchange
|publisher=The Open Group}}</ref> however, FreeBSD's pax lacks the extended PAX headers used for extended character set support. FreeBSD man pages sometimes indicate deviations from POSIX and thus SUS in their STANDARDS sections.<ref>{{man|1|awk|FreeBSD}}</ref>

OpenBSD man pages sometimes indicate deviations from POSIX and thus SUS in their STANDARDS sections.<ref>{{man|1|sh|OpenBSD}}</ref><ref>{{man|1|awk|OpenBSD}}</ref>

MINIX pax command does not support pax file format<ref>{{cite web|url=https://man.minix3.org/cgi-bin/man.cgi?query=pax&apropos=0&sektion=0&manpath=Minix+3.3.0&arch=default&format=html|title=pax(1)|website=man.minix3.org}}</ref> and thereby fails POSIX.1-2001.