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Single UNIX Specification

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</style><div role="note" class="hatnote navigation-not-searchable">"Unix V7" and "UNIX V7" redirect here. For the 1979 Research Unix release often called V7, see <a href="Version_7_Unix" title="Version 7 Unix">Version 7 Unix</a>.</div>

The Single UNIX Specification (SUS) is a standard for <a href="Computer" title="Computer">computer</a> <a href="Operating_system" title="Operating system">operating systems</a>,<a href="#cite_note-1">[1]</a><a href="#cite_note-2">[2]</a> compliance with which is required to qualify for using the "<a href="Unix" title="Unix">UNIX</a>" trademark. The standard specifies programming interfaces for the C language, a command-line shell, and user commands. The core specifications of the SUS known as Base Specifications are developed and maintained by the <a href="Austin_Group" title="Austin Group">Austin Group</a>, which is a joint working group of <a href="IEEE" class="mw-redirect" title="IEEE">IEEE</a>, <a href="ISO/IEC_JTC_1/SC_22" title="ISO/IEC JTC 1/SC 22">ISO/IEC JTC 1/SC 22</a>/WG 15 and <a href="The_Open_Group" title="The Open Group">The Open Group</a>. If an operating system is submitted to The Open Group for certification and passes conformance tests, then it is deemed to be compliant with a UNIX standard such as UNIX 98 or UNIX 03.

Very few <a href="BSD" class="mw-redirect" title="BSD">BSD</a> and <a href="Linux" title="Linux">Linux</a>-based operating systems are submitted for compliance with the Single UNIX Specification, although system developers generally aim for compliance with <a href="POSIX" title="POSIX">POSIX</a> standards, which form the core of the Single UNIX Specification.

The latest SUS consists of two parts: the base specifications technically identical to POSIX, and the X/Open Curses specification.<a href="#cite_note-3">[3]</a>

Some parts of the SUS are optional.

<div class="mw-heading mw-heading2"><h2 id="History">History</h2></div>

<div class="mw-heading mw-heading3"><h3 id="1980s:_Motivation">1980s: Motivation</h3></div>

The SUS emerged from multiple 1980s efforts to standardize <a href="Operating_system" title="Operating system">operating system</a> <a href="Interface_(computer_science)" class="mw-redirect" title="Interface (computer science)">interfaces</a> for software designed for variants of the Unix operating system. The need for standardization arose because enterprises using computers wanted to be able to develop programs that could be used on the computer systems of different manufacturers without reimplementing the programs. Unix was selected as the basis for a standard system interface partly because it was manufacturer-neutral.

In 1984, the UNIX user group called /usr/group published the results of their standardization effort for programming interfaces in their 1984 /usr/group standard, which became basis for what would become the POSIX.1-1988 standard.<a href="#cite_note-4">[4]</a><a href="#cite_note-5">[5]</a>

In 1985, AT&T published <a href="System_V_Interface_Definition" title="System V Interface Definition">System V Interface Definition</a> (SVID), a specification of UNIX System V programming interfaces.<a href="#cite_note-6">[6]</a>

<div class="mw-heading mw-heading3"><h3 id="1988:_POSIX">1988: POSIX</h3></div>

In 1988, standardization efforts resulted in IEEE 1003 (also registered as <a href="International_Organization_for_Standardization" title="International Organization for Standardization">ISO</a>/<a href="International_Electrotechnical_Commission" title="International Electrotechnical Commission">IEC</a> 9945), or <a href="POSIX" title="POSIX">POSIX</a>.1-1988, which loosely stands for Portable Operating System Interface.

<div class="mw-heading mw-heading3"><h3 id="1980s_and_1990s:_X/Open_Portability_Guide">1980s and 1990s: X/Open Portability Guide</h3></div>

The <a href="X/Open_Portability_Guide" class="mw-redirect" title="X/Open Portability Guide">X/Open Portability Guide</a> (XPG) was a precursor to the SUS, published by the <a href="X/Open_Company" class="mw-redirect" title="X/Open Company">X/Open Company</a>, a consortium of companies established in 1984. The guides were published in the following years.

<ul><li>XPG1: X/Open Portability Guide Issue 1: 1985<a href="#cite_note-raymond2003-7">[7]</a></li>

<li>XPG2: X/Open Portability Guide Issue 2: 1987<a href="#cite_note-raymond2003-7">[7]</a></li>

<li>XPG3: X/Open Portability Guide Issue 3: 1989<a href="#cite_note-8">[8]</a></li>

<li>XPG4: X/Open Portability Guide Issue 4: 1992<a href="#cite_note-raymond2003-7">[7]</a></li></ul>

XPG4 Base included the following documents:

<ul><li>System Interface Definitions, Issue 4, <style data-mw-deduplicate="TemplateStyles:r1238218222">

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</style><a href="ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <bdi>1-872630-46-4</bdi></li>

<li>System Interfaces and Headers, Issue 4, <a href="ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <bdi>1-872630-47-2</bdi></li>

<li>Commands and Utilities, Issue 4, <a href="ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <bdi>1-872630-48-0</bdi></li></ul>

In the early 1990s, a separate effort known as the Common API Specification or Spec 1170 was initiated by several major vendors,<a href="#cite_note-unixorgsus-9">[9]</a> who formed the <a href="Common_Open_Software_Environment" title="Common Open Software Environment">COSE</a> alliance in the wake of the <a href="Unix_wars" title="Unix wars">Unix wars</a>. In 1993, Spec 1170 was assigned by COSE to <a href="X/Open" title="X/Open">X/Open</a> for fasttrack.<a href="#cite_note-unixorghist-10">[10]</a> In October 1993, a planned transfer of UNIX trademark from Novell to X/Open was announced;<a href="#cite_note-11">[11]</a> it was finalized in 2nd quarter of 1994.<a href="#cite_note-12">[12]</a> Spec 1170 would eventually become the Single Unix Specification.<a href="#cite_note-unixorgsus-9">[9]</a>

<div class="mw-heading mw-heading3"><h3 id="1994:_Single_UNIX_Specification">1994: Single UNIX Specification</h3></div>

In 1994, the X/Open Company released the Single UNIX Specification.<a href="#cite_note-unixorgsus-9">[9]</a> The SUS was made up of documents that were part of the X/Open Common Applications Environment (CAE):<a href="#cite_note-unixorgsus-9">[9]</a>

<ul><li>System Interface Definitions, Issue 4, Version 2<a href="#cite_note-13">[13]</a></li>

<li>System Interfaces and Headers, Issue 4, Version 2<a href="#cite_note-14">[14]</a></li>

<li>Commands and Utilities, Issue 4, Version 2<a href="#cite_note-15">[15]</a></li>

<li>Networking Services, Issue 4<a href="#cite_note-16">[16]</a></li></ul>

This was a repackaging of the <a href="X/Open_Portability_Guide" class="mw-redirect" title="X/Open Portability Guide">X/Open Portability Guide</a> (XPG), Issue 4, Version 2.

Sources differ on whether X/Open Curses, Issue 4, Version 2 was part of this SUS;<a href="#cite_note-unixorgsus-9">[9]</a><a href="#cite_note-17">[17]</a> its copyright date is given as 1996.<a href="#cite_note-18">[18]</a> X/Open Curses, Issue 4 was published in 1995.<a href="#cite_note-19">[19]</a>

In October 1994, X/Open indicated they were going to refer to Spec 1170 as '"Single-Unix" specification'.<a href="#cite_note-20">[20]</a>

The SUS was at the core of the UNIX 95 brand.<a href="#cite_note-21">[21]</a>

This version had 1168 programming interfaces.<a href="#cite_note-v3howmanyapis-22">[22]</a>

This version of SUS was drawn from the following sources:<a href="#cite_note-unixorgsus-9">[9]</a>

<li><a href="System_V_Interface_Definition" title="System V Interface Definition">System V Interface Definition</a>, (SVID) Edition 3, Level 1 calls by AT&T</li>

<li>Application Environment Specification (AES) by the <a href="Open_Software_Foundation" title="Open Software Foundation">Open Software Foundation</a> (OSF)</li>

<li>Interfaces found in common use and not yet covered by a formal specification, drawn from a survey of major applications.</li></ul>

<div class="mw-heading mw-heading3"><h3 id="1997:_Single_UNIX_Specification,_version_2">1997: Single UNIX Specification, version 2</h3></div>

In 1996, X/Open merged with <a href="Open_Software_Foundation" title="Open Software Foundation">Open Software Foundation</a> (OSF) to form <a href="The_Open_Group" title="The Open Group">The Open Group</a>.<a href="#cite_note-23">[23]</a><a href="#cite_note-24">[24]</a>

In 1997, the Open Group released the Single UNIX Specification, Version 2.<a href="#cite_note-25">[25]</a><a href="#cite_note-26">[26]</a>

This specification consisted of:<a href="#cite_note-27">[27]</a>

<ul><li>System Interface Definitions, Issue 5,<a href="#cite_note-28">[28]</a></li>

<li>System Interfaces and Headers, Issue 5,<a href="#cite_note-29">[29]</a></li>

<li>Commands and Utilities, Issue 5,<a href="#cite_note-30">[30]</a></li>

<li>Networking Services, Issue 5,<a href="#cite_note-31">[31]</a></li>

<li>X/Open Curses, Issue 4, Version 2,<a href="#cite_note-32">[32]</a></li></ul>

and was at the core of the UNIX 98 brand.<a href="#cite_note-33">[33]</a>

This version had 1434 programming interfaces.<a href="#cite_note-v3howmanyapis-22">[22]</a>

<div class="mw-heading mw-heading3"><h3 id="2001:_Single_UNIX_Specification,_version_3,_POSIX.1-2001">2001: Single UNIX Specification, version 3, POSIX.1-2001</h3></div>

Beginning in 1998, a joint <a href="Working_group" title="Working group">working group</a> of IEEE, ISO JTC 1 SC22 and The Open Group known as the <a href="Austin_Group" title="Austin Group">Austin Group</a> began to develop the combined standard that would be known as the core of Single UNIX Specification, Version 3 and as POSIX.1-2001. It was released on January 30, 2002.<a href="#cite_note-34">[34]</a>

This SUS consisted of:<a href="#cite_note-unixorgv3-35">[35]</a>

<ul><li>Base Specifications, Issue 6

<ul><li>Base Definitions, Issue 6</li>

<li>System Interfaces, Issue 6</li>

<li>Shell and Utilities, Issue 6</li>

<li>Rationale (Informative)</li></ul></li>

<li>X/Open Curses, Issue 4, Version 2</li></ul>

and is at the core of the UNIX 03 brand.<a href="#cite_note-36">[36]</a>

The Base Specifications are technically identical to POSIX.1-2001, which is IEEE Std 1003.1-2001.<a href="#cite_note-unixorgv3-35">[35]</a>

This version had 1742 programming interfaces.<a href="#cite_note-v3howmanyapis-22">[22]</a>

An authorized guide is available for the version.<a href="#cite_note-37">[37]</a>

<div class="mw-heading mw-heading4"><h4 id="2004_Edition">2004 Edition</h4></div>

In 2004, a new edition of the POSIX.1-2001 standard was released, incorporating two technical corrigenda.<a href="#cite_note-38">[38]</a><a href="#cite_note-posix2004-39">[39]</a> It is called IEEE Std 1003.1, 2004 Edition.<a href="#cite_note-posix2004-39">[39]</a> Some informally call it POSIX.1-2004,<a href="#cite_note-40">[40]</a><a href="#cite_note-41">[41]</a><a href="#cite_note-42">[42]</a> but this is not an official identification.

<div class="mw-heading mw-heading3"><h3 id="2008:_Single_UNIX_Specification,_version_4,_POSIX.1-2008">2008: Single UNIX Specification, version 4, POSIX.1-2008</h3></div>

In December 2008, the <a href="Austin_Group" title="Austin Group">Austin Group</a> published a new major revision of SUS and POSIX.<a href="#cite_note-43">[43]</a><a href="#cite_note-44">[44]</a><a href="#cite_note-45">[45]</a> This is the Single UNIX Specification, Version 4 (SUSv4).<a href="#cite_note-46">[46]</a>

This SUS consists of:<a href="#cite_note-unixorgv4-47">[47]</a>

<ul><li>Base Specifications, Issue 7

<ul><li>Base Definitions, Issue 7</li>

<li>System Interfaces, Issue 7</li>

<li>Shell and Utilities, Issue 7</li>

<li>Rationale, Issue 7, (Informative)</li></ul></li>

<li>X/Open Curses, Issue 7</li></ul>

The Base Specifications are technically identical to POSIX.1-2008, which is IEEE Std 1003.1-2008.<a href="#cite_note-unixorgv4-47">[47]</a>

This version had 1833 interfaces, of which 1191 were in the System Interfaces section.<a href="#cite_note-48">[48]</a>

<div class="mw-heading mw-heading4"><h4 id="2013_Edition">2013 Edition</h4></div>

Technical Corrigendum 1 mostly targeted internationalization, and also introduced a role-based access model. A trademark UNIX V7 (not to be confused with <a href="Version_7_Unix" title="Version 7 Unix">V7 UNIX</a>, the version of <a href="Research_Unix" title="Research Unix">Research Unix</a> from 1979) was created to mark compliance with SUS Version 4.<a href="#cite_note-49">[49]</a>

<div class="mw-heading mw-heading4"><h4 id="2016_Edition">2016 Edition</h4></div>

Technical Corrigendum 2 was published in September 2016, leading into IEEE Std 1003.1-2008, 2016 Edition and Single UNIX Specification, Version 4, 2016 Edition.

<div class="mw-heading mw-heading4"><h4 id="2018_Edition,_POSIX.1-2017">2018 Edition, POSIX.1-2017</h4></div>

In January 2018, an "administrative rollup" edition was released. It incorporates Single UNIX Specification version 4 TC1 and TC2, and is technically identical to the 2016 edition.<a href="#cite_note-50">[50]</a>

The Base Specifications are technically identical to POSIX.1-2017, which is IEEE Std 1003.1-2017.<a href="#cite_note-51">[51]</a>

<div class="mw-heading mw-heading2"><h2 id="Specification">Specification</h2></div>

SUSv3 totals some 3700 pages, which are divided into four main parts:

<ul><li>Base Definitions (XBD) - a list of definitions and conventions used in the specifications and a list of <a href="C_header_file" class="mw-redirect" title="C header file">C header files</a> which must be provided by compliant systems. 84 header files in total are provided.</li>

<li>Shell and Utilities (XCU) - a list of utilities and a description of the shell, <a href="Bourne_shell" title="Bourne shell">sh</a>. 160 utilities in total are specified.</li>

<li>System Interfaces (XSH) - contains the specification of various functions which are implemented as <a href="System_call" title="System call">system calls</a> or <a href="Library_(computing)" title="Library (computing)">library</a> functions. 1123 system interfaces in total are specified.</li>

<li>Rationale (XRAT) - the explanation behind the standard.</li></ul>

The standard user command line and scripting interface is the <a href="POSIX" title="POSIX">POSIX</a> shell, an extension of the <a href="Bourne_Shell" class="mw-redirect" title="Bourne Shell">Bourne Shell</a> based on an early version of the <a href="Korn_Shell" class="mw-redirect" title="Korn Shell">Korn Shell</a>. Other user-level programs, services and utilities include <a href="AWK" title="AWK">awk</a>, <a href="Echo_(command)" title="Echo (command)">echo</a>, <a href="Ed_(text_editor)" class="mw-redirect" title="Ed (text editor)">ed</a>, <a href="Vi_(text_editor)" title="Vi (text editor)">vi</a>, and hundreds of others. Required program-level services include basic <a href="Input/output" title="Input/output">I/O</a> (<a href="Computer_file" title="Computer file">file</a>, <a href="Computer_terminal" title="Computer terminal">terminal</a>, and <a href="Computer_network" title="Computer network">network</a>) services. A test suite accompanies the standard. It is called PCTS or the POSIX Certification Test Suite.

Additionally, SUS includes <a href="Curses_(programming_library)" title="Curses (programming library)">CURSES</a> (XCURSES) specification, which specifies 372 functions and 3 header files. All in all, SUSv3 specifies 1742 interfaces.

Note that a system need not include <a href="Source_code" title="Source code">source code</a> derived in any way from AT&T Unix to meet the specification. For instance, <a href="IBM" title="IBM">IBM</a> <a href="OS/390" title="OS/390">OS/390</a>, now <a href="Z/OS" title="Z/OS">z/OS</a>, qualifies as UNIX despite having no code in common.<a href="#cite_note-52">[52]</a>

<div class="mw-heading mw-heading2"><h2 id="Marks_for_compliant_systems">Marks for compliant systems</h2></div>

There are five official marks for conforming systems:<a href="#cite_note-53">[53]</a><a href="#cite_note-54">[54]</a>

<li>UNIX 95 - the mark for systems conforming to version 1 of the SUS<a href="#cite_note-UNIX_95-56">[56]</a></li>

<li>UNIX 98 - the mark for systems conforming to version 2 of the SUS<a href="#cite_note-UNIX_98-57">[57]</a></li>

<li>UNIX 03 - the mark for systems conforming to version 3 of the SUS<a href="#cite_note-UNIX_03-58">[58]</a></li>

<li>UNIX V7 - the mark for systems conforming to version 4 of the SUS (including Corrigenda)<a href="#cite_note-UNIX_V7-59">[59]</a><a href="#cite_note-60">[60]</a></li></ul>

<div class="mw-heading mw-heading2"><h2 id="Compliance">Compliance</h2></div>

<th>Product

</th>

<th>Vendor

</th>

<th>Architecture

</th>

</th>

</th>

</th>

</th>

</th></tr>

<tr>

</td>

<td><a href="IBM_Corporation" class="mw-redirect" title="IBM Corporation">IBM Corporation</a>

</td>

<td><a href="Power_ISA" title="Power ISA">POWER processors</a>

</td>

<td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes

</td>

<td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes

</td>

<td style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no">No

</td>

<td style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no">No

</td>

<td style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no">No

</td></tr>

<tr>

</td>

<td><a href="Hewlett_Packard_Enterprise" title="Hewlett Packard Enterprise">Hewlett Packard Enterprise</a>

</td>

</td>

<td style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no">No

</td>

<td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes

</td>

<td style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no">No

</td>

<td style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no">No

</td>

<td style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no">No

</td></tr>

<tr>

<td><a href="MacOS" title="MacOS">macOS</a>

</td>

<td><a href="Apple_Inc." title="Apple Inc.">Apple</a>

</td>

</td>

<td style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no">No

</td>

<td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes

</td>

<td style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no">No

</td>

<td style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no">No

</td>

<td style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no">No

</td></tr>

<tr>

<td><a href="SCO_OpenServer" class="mw-redirect" title="SCO OpenServer">OpenServer</a>

</td>

<td><a href="Xinuos" title="Xinuos">Xinuos</a>

</td>

</td>

<td style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no">No

</td>

<td style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no">No

</td>

<td style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no">No

</td>

<td style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no">No

</td>

<td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes

</td></tr>

<tr>

<td><a href="UnixWare" title="UnixWare">UnixWare</a>

</td>

<td><a href="Xinuos" title="Xinuos">Xinuos</a>

</td>

</td>

<td style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no">No

</td>

<td style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no">No

</td>

<td style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no">No

</td>

<td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes

</td>

<td style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no">No

</td></tr>

<tr>

</td>

<td><a href="IBM_Corporation" class="mw-redirect" title="IBM Corporation">IBM Corporation</a>

</td>

<td><a href="Z/Architecture" title="Z/Architecture">z/Architecture</a>

</td>

<td style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no">No

</td>

<td style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no">No

</td>

<td style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no">No

</td>

<td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes

</td>

<td style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no">No

</td></tr></tbody></table>

<div class="mw-heading mw-heading3"><h3 id="Currently_registered_UNIX_systems">Currently registered UNIX systems</h3></div>

<a href="IBM_AIX" title="IBM AIX">AIX</a> version 7, at either 7.1 TL5 (or later) or 7.2 TL2 (or later) are registered as UNIX 03 compliant.<a href="#cite_note-61">[61]</a> AIX version 7, at 7.2 TL5 (or later) are registered as UNIX V7 compliant.<a href="#cite_note-62">[62]</a> Older versions were previously certified to the UNIX 95 and UNIX 98 marks.<a href="#cite_note-2003-register-63">[63]</a>

<a href="HP-UX" title="HP-UX">HP-UX</a> 11i V3 Release B.11.31 is registered as UNIX 03 compliant. Previous releases were registered as UNIX 95.<a href="#cite_note-64">[64]</a>

<div class="mw-heading mw-heading4"><h4 id="macOS">macOS</h4></div>

<a href="Apple_Inc." title="Apple Inc.">Apple</a> <a href="MacOS" title="MacOS">macOS</a> (formerly known as Mac OS X and OS X) is registered as UNIX 03 compliant.<a href="#cite_note-65">[65]</a> The first version registered was <a href="Mac_OS_X_Leopard" title="Mac OS X Leopard">Mac OS X 10.5 Leopard</a>, certified on October 26, 2007 (on x86 systems).<a href="#cite_note-66">[66]</a><a href="#cite_note-67">[67]</a> All versions of <a href="MacOS" title="MacOS">macOS</a> from Mac OS X Leopard to <a href="MacOS_Catalina" title="MacOS Catalina">macOS 10.15 Catalina</a>, except for <a href="Mac_OS_X_Lion" class="mw-redirect" title="Mac OS X Lion">OS X Lion</a>,<a href="#cite_note-68">[68]</a> have been registered on Intel-based systems, and all versions from <a href="MacOS_Big_Sur" title="MacOS Big Sur">macOS 11 Big Sur</a>, the successor to macOS Catalina, up to <a href="MacOS_Sequoia" title="MacOS Sequoia">macOS 15 Sequoia</a> have been registered on both x86-64 and ARM64 systems.<a href="#cite_note-69">[69]</a>

<div class="mw-heading mw-heading4"><h4 id="Xinuos">Xinuos</h4></div>

<a href="UnixWare" title="UnixWare">UnixWare</a> 7.1.3 and later is registered as UNIX 95 compliant.

<a href="OpenServer" title="OpenServer">OpenServer</a> 5 and 6 are registered as UNIX 93 compliant.

IBM <a href="Z/OS" title="Z/OS">z/OS</a> 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.<a href="#cite_note-70">[70]</a>

<div class="mw-heading mw-heading3"><h3 id="Previously_registered_UNIX_systems">Previously registered UNIX systems</h3></div>

<div class="mw-heading mw-heading4"><h4 id="EulerOS">EulerOS</h4></div>

<a href="EulerOS" title="EulerOS">EulerOS</a> 2.0 for the <a href="X86-64" title="X86-64">x86-64</a> architecture was registered as UNIX 03 compliant.<a href="#cite_note-71">[71]</a><a href="#cite_note-euler-cert-72">[72]</a> The UNIX 03 conformance statement shows that the standard C compiler is from the <a href="GNU_Compiler_Collection" title="GNU Compiler Collection">GNU Compiler Collection</a> (<style data-mw-deduplicate="TemplateStyles:r886049734">

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</style>gcc), and that the system is a <a href="Linux_distribution" title="Linux distribution">Linux distribution</a> of the <a href="Red_Hat_Enterprise_Linux" title="Red Hat Enterprise Linux">Red Hat Enterprise Linux</a> family.<a href="#cite_note-EulerOS_conformance_commands-73">[73]</a> The UNIX 03 certification expired in September 2022 and has not been renewed.<a href="#cite_note-euler-cert-72">[72]</a>

<a href="Stratus_Technologies" title="Stratus Technologies">Stratus Technologies</a> DNCP Series servers running FTX Release 3 were registered as UNIX 93 compliant.<a href="#cite_note-74">[74]</a>

<div class="mw-heading mw-heading4"><h4 id="Inspur_K-UX">Inspur K-UX</h4></div>

<a href="Inspur_K-UX" title="Inspur K-UX">Inspur K-UX</a> 2.0 and 3.0 for the <a href="X86-64" title="X86-64">x86-64</a> architecture were certified as UNIX 03 compliant.<a href="#cite_note-75">[75]</a><a href="#cite_note-inspur_conformance_statement-76">[76]</a> The UNIX 03 conformance statement for Inspur K-UX 2.0 and 3.0 shows that the standard C compiler is from the <a href="GNU_Compiler_Collection" title="GNU Compiler Collection">GNU Compiler Collection</a> (gcc), and that the system is a <a href="Linux_distribution" title="Linux distribution">Linux distribution</a> of the <a href="Red_Hat" title="Red Hat">Red Hat</a> family.<a href="#cite_note-inspur_conformance_commands-77">[77]</a>

<a href="Silicon_Graphics" title="Silicon Graphics">SGI</a> <a href="IRIX" title="IRIX">IRIX</a> 6.5 was registered as UNIX 95 compliant.<a href="#cite_note-78">[78]</a>

IBM <a href="OS/390" title="OS/390">OS/390</a> was registered as UNIX 95 compliant beginning with the V2R4 release.<a href="#cite_note-79">[79]</a>

<div class="mw-heading mw-heading4"><h4 id="Reliant_UNIX">Reliant UNIX</h4></div>

The last <a href="Reliant_UNIX" class="mw-redirect" title="Reliant UNIX">Reliant UNIX</a> versions were registered as UNIX 95 compliant (XPG4 hard branding).

<div class="mw-heading mw-heading4"><h4 id="Solaris">Solaris</h4></div>

<a href="Solaris_(operating_system)" class="mw-redirect" title="Solaris (operating system)">Solaris</a> 11.4 was previously registered as UNIX v7 compliant in 2018.<a href="#cite_note-80">[80]</a> Solaris 11 and Solaris 10 were registered as UNIX 03 compliant on <a href="32-bit" class="mw-redirect" title="32-bit">32-bit</a> and <a href="64-bit" class="mw-redirect" title="64-bit">64-bit</a> <a href="X86" title="X86">x86</a> (<a href="X86-64" title="X86-64">X86-64</a>) and <a href="SPARC" title="SPARC">SPARC</a> systems. Solaris 8 and 9 were registered as UNIX 98 compliant on <a href="32-bit" class="mw-redirect" title="32-bit">32-bit</a> <a href="X86" title="X86">x86</a> and <a href="SPARC" title="SPARC">SPARC</a> 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.<a href="#cite_note-2003-register-63">[63]</a>

Solaris 2.5.1 was also registered as UNIX 95 compliant on the <a href="PReP" class="mw-redirect" title="PReP">PReP</a> <a href="PowerPC" title="PowerPC">PowerPC</a> platform in 1996, but the product was withdrawn before more than a few dozen copies had been sold.<a href="#cite_note-81">[81]</a>

<a href="Tru64_UNIX" title="Tru64 UNIX">Tru64 UNIX</a> V5.1A and later were registered as UNIX 98 compliant.<a href="#cite_note-82">[82]</a>

<div class="mw-heading mw-heading4"><h4 id="Other">Other</h4></div>

Other operating systems previously registered as UNIX 95 or UNIX 93 compliant:

<div class="mw-heading mw-heading3"><h3 id="Non-registered_Unix-like_systems">Non-registered Unix-like systems</h3></div>

Developers and vendors of <a href="Unix-like" title="Unix-like">Unix-like</a> operating systems such as <a href="Linux" title="Linux">Linux</a>, <a href="FreeBSD" title="FreeBSD">FreeBSD</a>, and <a href="MINIX" class="mw-redirect" title="MINIX">MINIX</a> typically do not certify their distributions and do not install full POSIX utilities by default.

For Linux, <a href="Pax_(command)" title="Pax (command)">pax</a> command is usually not installed; furthermore, pax command packages available for Linux often lack pax file format support required by POSIX.<a href="#cite_note-83">[83]</a> Sometimes, SUS compliance can be improved by installing additional packages, but very few Linux systems can be configured to be completely conformant. The <a href="Linux_Standard_Base" title="Linux Standard Base">Linux Standard Base</a> 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.<a href="#cite_note-84">[84]</a><a href="#cite_note-85">[85]</a> Few <a href="Linux_distribution" title="Linux distribution">Linux distributions</a> actually go through certification as LSB compliant.<a href="#cite_note-86">[86]</a>

<a href="Darwin_(operating_system)" title="Darwin (operating system)">Darwin</a>, the open source subset of macOS, has behavior that can be set to comply with UNIX 03.<a href="#cite_note-87">[87]</a><a href="#cite_note-88">[88]</a> Darwin uses a 4.4BSD-derived pax command,<a href="#cite_note-89">[89]</a> which lacks multibyte support for filenames.

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.<a href="#cite_note-90">[90]</a> FreeBSD pax command, derived from 4.4BSD, does not fully support pax file format.<a href="#cite_note-91">[91]</a> pax and ustar in-archive format use the same with slightly different defaults (5120 block size vs 10240 block size);<a href="#cite_note-92">[92]</a> 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.<a href="#cite_note-93">[93]</a>

OpenBSD man pages sometimes indicate deviations from POSIX and thus SUS in their STANDARDS sections.<a href="#cite_note-94">[94]</a><a href="#cite_note-95">[95]</a>

MINIX pax command does not support pax file format<a href="#cite_note-96">[96]</a> and thereby fails POSIX.1-2001.

<div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2></div>

<dl><dd><a rel="nofollow" class="external text" href="https://pubs.opengroup.org/onlinepubs/9799919799/">POSIX.1-2024 online version</a></dd></dl>

<ul><li><a href="List_of_Unix_commands" class="mw-redirect" title="List of Unix commands">List of Unix commands</a></li>

<li><a href="Functional_specification" title="Functional specification">Functional specification</a></li>

<li><a href="Open_standard" title="Open standard">Open standard</a></li>

<li><a href="Open_system_(computing)" title="Open system (computing)">Open system (computing)</a></li>

<li><a href="POSIX" title="POSIX">POSIX</a></li>

<li><a href="Manual_page_(Unix)" class="mw-redirect" title="Manual page (Unix)">UNIX manual</a></li>

<div class="mw-heading mw-heading2"><h2 id="References">References</h2></div>

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</style><div class="reflist">

<li id="cite_note-1"><a href="#cite_ref-1">^</a> <cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://unix.org/questions_answers.html">"Questions & Answers"</a>. unix.org.</cite>

</li>

<li id="cite_note-2"><a href="#cite_ref-2">^</a> <cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.opengroup.org/membership/forums/platform/unix">"The UNIX Standard"</a>. <a href="The_Open_Group" title="The Open Group">The Open Group</a>. August 27, 2018.</cite>

</li>

<li id="cite_note-3"><a href="#cite_ref-3">^</a> <cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://publications.opengroup.org/standards/unix/t101">"Single UNIX Specification, Version 4, 2018 Edition"</a>. <a href="The_Open_Group" title="The Open Group">The Open Group</a>.</cite>

</li>

<li id="cite_note-4"><a href="#cite_ref-4">^</a> <cite id="CITEREFKelty" class="citation web cs1">Kelty, Christopher M. <a rel="nofollow" class="external text" href="https://kelty.org/or/papers/Kelty_WULP_Conceiving_2009.pdf">"Conceiving Open Systems"</a> (PDF). kelty.org.</cite>

</li>

<li id="cite_note-5"><a href="#cite_ref-5">^</a> <cite class="citation book cs1"><a rel="nofollow" class="external text" href="https://docs.oracle.com/cd/E19641-01/802-1953/802-1953.pdf">Standards Conformance Guide</a> (PDF). SunSoft. November 1995.</cite>

</li>

<li id="cite_note-6"><a href="#cite_ref-6">^</a> <cite class="citation book cs1"><a rel="nofollow" class="external text" href="https://books.google.com/books?id=QcG4wAEACAAJ">System V Interface Definition</a>. 1985. <a href="ASIN_(identifier)" class="mw-redirect" title="ASIN (identifier)">ASIN</a> <a rel="nofollow" class="external text" href="https://www.amazon.com/dp/B000KF6SCE">B000KF6SCE</a>.</cite>

</li>

<li id="cite_note-raymond2003-7">^ <a href="#cite_ref-raymond2003_7-0">a</a> <a href="#cite_ref-raymond2003_7-1">b</a> <a href="#cite_ref-raymond2003_7-2">c</a> <cite id="CITEREFRaymond2003" class="citation book cs1"><a href="Eric_S._Raymond" title="Eric S. Raymond">Raymond, Eric S.</a> (September 19, 2003). <a rel="nofollow" class="external text" href="http://www.catb.org/~esr/writings/taoup/html/ch17s02.html#id2994594">"Standards and the Unix Wars"</a>. <a rel="nofollow" class="external text" href="http://www.catb.org/~esr/writings/taoup/html/">The Art of UNIX Programming</a>.</cite>

</li>

<li id="cite_note-8"><a href="#cite_ref-8">^</a> <cite id="CITEREFStevensFennerRudoff2003" class="citation book cs1"><a href="W._Richard_Stevens" title="W. Richard Stevens">Stevens, W. Richard</a>; Fenner, Bill; Rudoff, Andrew M. (2003). Unix Network Programming, Volume 1: The Sockets Networking API (3rd ed.). Addison-Wesley Professional. <a href="ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <bdi>978-0131411555</bdi>. <a href="OCLC_(identifier)" class="mw-redirect" title="OCLC (identifier)">OCLC</a> <a rel="nofollow" class="external text" href="https://search.worldcat.org/oclc/53867239">53867239</a>.</cite>

</li>

<li id="cite_note-unixorgsus-9">^ <a href="#cite_ref-unixorgsus_9-0">a</a> <a href="#cite_ref-unixorgsus_9-1">b</a> <a href="#cite_ref-unixorgsus_9-2">c</a> <a href="#cite_ref-unixorgsus_9-3">d</a> <a href="#cite_ref-unixorgsus_9-4">e</a> <a href="#cite_ref-unixorgsus_9-5">f</a> <cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://unix.org/what_is_unix/single_unix_specification.html">"The Single UNIX Specification"</a>. unix.org.</cite>

</li>

<li id="cite_note-unixorghist-10"><a href="#cite_ref-unixorghist_10-0">^</a> <cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://unix.org/what_is_unix/history_timeline.html">"The UNIX System -- History and Timeline -- UNIX History"</a>. unix.org.</cite>

</li>

<li id="cite_note-11"><a href="#cite_ref-11">^</a> <cite id="CITEREFFennessy1993" class="citation newsgroup cs1">Fennessy, Quentin (October 12, 1993). <a rel="nofollow" class="external text" href="https://groups.google.com/g/comp.std.unix/c/Jblvq9RejzI/m/ypx8LcZjBmEJ">"The name "UNIX" is now the property of X/Open"</a>. <a href="Usenet_newsgroup" title="Usenet newsgroup">Newsgroup</a>: <a rel="nofollow" class="external text" href="news:comp.std.unix">comp.std.unix</a>.</cite>

</li>

<li id="cite_note-12"><a href="#cite_ref-12">^</a> <cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://unix.org/questions_answers/faq.html">"Frequently Asked Questions"</a>. unix.org.</cite>

</li>

<li id="cite_note-13"><a href="#cite_ref-13">^</a> <cite class="citation book cs1"><a rel="nofollow" class="external text" href="https://pubs.opengroup.org/onlinepubs/009656599/toc.pdf">X/Open CAE Specification System Interface Definitions, Issue 4, Version 2</a> (PDF). X/Open Company. 1994.</cite>

</li>

<li id="cite_note-14"><a href="#cite_ref-14">^</a> <cite class="citation book cs1"><a rel="nofollow" class="external text" href="https://pubs.opengroup.org/onlinepubs/9695969499/toc.pdf">X/Open CAE Specification System Interfaces and Headers, Issue 4, Version 2</a> (PDF). X/Open Company. 1994.</cite>

</li>

<li id="cite_note-15"><a href="#cite_ref-15">^</a> <cite class="citation book cs1"><a rel="nofollow" class="external text" href="https://pubs.opengroup.org/onlinepubs/009656399/toc.pdf">X/Open CAE Specification Commands and Utilities, Issue 4, Version 2</a> (PDF). X/Open Company. 1994.</cite>

</li>

<li id="cite_note-16"><a href="#cite_ref-16">^</a> <cite class="citation book cs1"><a rel="nofollow" class="external text" href="https://pubs.opengroup.org/onlinepubs/009656199/toc.pdf">X/Open CAE Specification Networking Services, Issue 4</a> (PDF). X/Open Company. 1994.</cite>

</li>

<li id="cite_note-17"><a href="#cite_ref-17">^</a> <cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://publications.opengroup.org/c43x">"Single UNIX® Specification, Version 1 Document Set (UNIX 95)"</a>. opengroup.org. Retrieved May 25, 2021.</cite>

</li>

<li id="cite_note-18"><a href="#cite_ref-18">^</a> <cite class="citation book cs1"><a rel="nofollow" class="external text" href="https://pubs.opengroup.org/onlinepubs/009638999/toc.pdf">X/Open Curses, Issue 4, Version 2</a> (PDF). X/Open Company. 1996. <a href="ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <bdi>1-85912-171-3</bdi>.</cite>

</li>

<li id="cite_note-19"><a href="#cite_ref-19">^</a> <cite class="citation book cs1"><a rel="nofollow" class="external text" href="https://books.google.com/books?id=PYFCAAAACAAJ">X/Open Curses, Issue 4</a>. X/Open Company. 1995. <a href="ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <bdi>9781859120774</bdi>.</cite>

</li>

<li id="cite_note-20"><a href="#cite_ref-20">^</a> <cite id="CITEREFBozman1994" class="citation magazine cs1">Bozman, Jean S. (October 24, 1994). <a rel="nofollow" class="external text" href="https://books.google.com/books?id=Ilp0BEVTY3gC&pg=PA49">"X/Open test suites advance"</a>. <a href="Computerworld" title="Computerworld">Computerworld</a>. Vol. 28, no. 43. p. 49.</cite>

</li>

<li id="cite_note-21"><a href="#cite_ref-21">^</a> <cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.opengroup.org/openbrand/register/xum4.htm">"Open Brand - UNIX 95"</a>. <a href="The_Open_Group" title="The Open Group">The Open Group</a>.</cite>

</li>

<li id="cite_note-v3howmanyapis-22">^ <a href="#cite_ref-v3howmanyapis_22-0">a</a> <a href="#cite_ref-v3howmanyapis_22-1">b</a> <a href="#cite_ref-v3howmanyapis_22-2">c</a> <cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://unix.org/version3/howmany.html">"How many APIS are there?"</a>. unix.org.</cite>

</li>

<li id="cite_note-23"><a href="#cite_ref-23">^</a> <cite id="CITEREFMcCrea1996" class="citation journal cs1">McCrea, Phil (April 1996). <a rel="nofollow" class="external text" href="https://books.google.com/books?id=t_HcO8cY91IC&pg=PA17">"Formation of 'The Open Group'"</a>. AUGGN: The Journal of AUUG Inc. 17 (2): 17–18.</cite>

</li>

<li id="cite_note-24"><a href="#cite_ref-24">^</a> <cite id="CITEREFGaudin1996" class="citation magazine cs1">Gaudin, Sharon (May 27, 1996). <a rel="nofollow" class="external text" href="https://books.google.com/books?id=GTHir58nwGgC&pg=PT71">"WebCrusader may blaze wider trail for DCE users"</a>. <a href="Computerworld" title="Computerworld">Computerworld</a>. Vol. 30, no. 22. p. 64.</cite>

</li>

<li id="cite_note-25"><a href="#cite_ref-25">^</a> <cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.opengroup.org/onlinepubs/7990989775/">"The Single UNIX Specification, Version 2"</a>. www.opengroup.org.</cite>

</li>

<li id="cite_note-26"><a href="#cite_ref-26">^</a> <cite class="citation pressrelease cs1"><a rel="nofollow" class="external text" href="https://unix.org/version2/pr.html">"The Open Group Announces Enhanced Single UNIX Specification"</a> (Press release). The Open Group. March 12, 1997. Retrieved July 26, 2009.</cite>

</li>

<li id="cite_note-27"><a href="#cite_ref-27">^</a> <cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://unix.org/version2/whatsnew/login_whatsnew.html">"What's New in the Single UNIX Specification, Version 2"</a>. unix.org.</cite>

</li>

<li id="cite_note-28"><a href="#cite_ref-28">^</a> <cite class="citation book cs1"><a rel="nofollow" class="external text" href="https://pubs.opengroup.org/onlinepubs/9693999499/toc.pdf">System Interface Definitions Issue 5</a> (PDF). <a href="The_Open_Group" title="The Open Group">The Open Group</a>.</cite>

</li>

<li id="cite_note-29"><a href="#cite_ref-29">^</a> <cite class="citation book cs1"><a rel="nofollow" class="external text" href="https://pubs.opengroup.org/onlinepubs/009639399/toc.pdf">System Interfaces and Headers Issue 5</a> (PDF). <a href="The_Open_Group" title="The Open Group">The Open Group</a>.</cite>

</li>

<li id="cite_note-30"><a href="#cite_ref-30">^</a> <cite class="citation book cs1"><a rel="nofollow" class="external text" href="https://pubs.opengroup.org/onlinepubs/009639599/toc.pdf">Commands and Utilities Issue 5</a> (PDF). <a href="The_Open_Group" title="The Open Group">The Open Group</a>.</cite>

</li>

<li id="cite_note-31"><a href="#cite_ref-31">^</a> <cite class="citation book cs1"><a rel="nofollow" class="external text" href="https://pubs.opengroup.org/onlinepubs/9647699/toc.pdf">Networking Services (XNS) Issue 5</a> (PDF). <a href="The_Open_Group" title="The Open Group">The Open Group</a>. May 14, 1997. <a href="ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <bdi>1-85912-165-9</bdi>.</cite>

</li>

<li id="cite_note-32"><a href="#cite_ref-32">^</a> <cite class="citation book cs1"><a rel="nofollow" class="external text" href="https://pubs.opengroup.org/onlinepubs/009638999/toc.pdf">X/Open Curses, Issue 4, Version 2</a> (PDF). <a href="The_Open_Group" title="The Open Group">The Open Group</a>. 1996. <a href="ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <bdi>1-85912-171-3</bdi>.</cite>

</li>

<li id="cite_note-33"><a href="#cite_ref-33">^</a> <cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.opengroup.org/openbrand/register/xxm0.htm">"Open Brand - UNIX 98"</a>. X/Open Company.</cite>

</li>

<li id="cite_note-34"><a href="#cite_ref-34">^</a> <cite class="citation pressrelease cs1"><a rel="nofollow" class="external text" href="https://unix.org/version3/pr.html">"The Open Group announces completion of the joint revision to POSIX and the Single UNIX Specification"</a> (Press release). The Open Group. January 30, 2002. Retrieved July 26, 2009.</cite>

</li>

<li id="cite_note-unixorgv3-35">^ <a href="#cite_ref-unixorgv3_35-0">a</a> <a href="#cite_ref-unixorgv3_35-1">b</a> <cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://unix.org/version3/overview.html">"The Single UNIX Specification Version 3 - Overview"</a>. unix.org.</cite>

</li>

<li id="cite_note-36"><a href="#cite_ref-36">^</a> <cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.opengroup.org/openbrand/register/xym0.htm">"Open Brand - UNIX 03"</a>. <a href="The_Open_Group" title="The Open Group">The Open Group</a>.</cite>

</li>

<li id="cite_note-37"><a href="#cite_ref-37">^</a> <cite class="citation book cs1"><a rel="nofollow" class="external text" href="https://pubs.opengroup.org/onlinepubs/9299959899/toc.pdf">The Single UNIX Specification: The Authorized Guide to Version 3, 2nd Edition</a> (PDF). <a href="The_Open_Group" title="The Open Group">The Open Group</a>.</cite>

</li>

<li id="cite_note-38"><a href="#cite_ref-38">^</a> <cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.opengroup.org/onlinepubs/009695399/">"The Open Group Base Specifications Issue 6"</a>. <a href="The_Open_Group" title="The Open Group">The Open Group</a>.</cite>

</li>

<li id="cite_note-posix2004-39">^ <a href="#cite_ref-posix2004_39-0">a</a> <a href="#cite_ref-posix2004_39-1">b</a> <cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://unix.org/version3/ieee_std.html">"IEEE Std 1003.1, 2004 Edition"</a>. Retrieved July 26, 2009.</cite>

</li>

<li id="cite_note-40"><a href="#cite_ref-40">^</a> <cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://docs.oracle.com/cd/E36784_01/html/E36883/posix.1-5.html">"POSIX.1(5)"</a>. Oracle Solaris 11.2 Information Library.</cite>

</li>

<li id="cite_note-41"><a href="#cite_ref-41">^</a> <cite class="citation book cs1"><a rel="nofollow" class="external text" href="https://www.gnu.org/software/libc/manual/html_node/Feature-Test-Macros.html">"1.3.4 Feature Test Macros"</a>. <a rel="nofollow" class="external text" href="https://www.gnu.org/software/libc/manual/html_node/index.html">The GNU C Library manual</a>. <a href="The_GNU_Project" class="mw-redirect" title="The GNU Project">The GNU Project</a>.</cite>

</li>

<li id="cite_note-42"><a href="#cite_ref-42">^</a> <cite class="citation conference cs1">POSIX Abstractions in Modern Operating Systems: The Old, the New, and the Missing. Eleventh European Conference on Computer Systems. <a href="Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1145%2F2901318.2901350">10.1145/2901318.2901350</a>.</cite>

</li>

<li id="cite_note-43"><a href="#cite_ref-43">^</a> <cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.opengroup.org/onlinepubs/9699919799/">"The Open Group Base Specifications Issue 7, 2018 edition"</a>. www.opengroup.org.</cite>

</li>

<li id="cite_note-44"><a href="#cite_ref-44">^</a> <cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.opengroup.org/bookstore/catalog/c082.htm">"Base Specifications, Issue 7"</a>. The Open Group. Retrieved July 26, 2009.</cite>

</li>

<li id="cite_note-45"><a href="#cite_ref-45">^</a> <cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.opengroup.org/austin/">"The Austin Common Standards Revision Group"</a>. The Open Group. Retrieved July 26, 2009.</cite>

</li>

<li id="cite_note-46"><a href="#cite_ref-46">^</a> <cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://unix.net/version4">"Single UNIX Specification Version 4"</a>. The Open Group.</cite>

</li>

<li id="cite_note-unixorgv4-47">^ <a href="#cite_ref-unixorgv4_47-0">a</a> <a href="#cite_ref-unixorgv4_47-1">b</a> <cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://unix.org/version4/overview.html">"The Single UNIX Specification Version 4 - Introduction"</a>. unix.org.</cite>

</li>

<li id="cite_note-48"><a href="#cite_ref-48">^</a> <cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://unix.org/version4/interfaces.html">"Version 4 Interface Counts"</a>. unix.org.</cite>

</li>

<li id="cite_note-49"><a href="#cite_ref-49">^</a> <cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://unix.org/unixv7.html">"UNIX V7 Certification"</a>. unix.org.</cite>

</li>

<li id="cite_note-50"><a href="#cite_ref-50">^</a> <cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://publications.opengroup.org/c181">"Base Specifications, Issue 7, 2018 Edition"</a>. The Open Group. Retrieved July 6, 2018.</cite>

</li>

<li id="cite_note-51"><a href="#cite_ref-51">^</a> <cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://standards.ieee.org/ieee/1003.1/7101/">"IEEE SA - IEEE/Open Group 1003.1-2017"</a>. <a href="IEEE" class="mw-redirect" title="IEEE">IEEE</a>.</cite>

</li>

<li id="cite_note-52"><a href="#cite_ref-52">^</a> <cite id="CITEREFMatzan2004" class="citation web cs1">Matzan, Jem (July 30, 2004). <a rel="nofollow" class="external text" href="https://www.linux.com/news/can-gnu-ever-be-unix/">"Can GNU ever be Unix?"</a>. linux.com.</cite>

</li>

<li id="cite_note-53"><a href="#cite_ref-53">^</a> <cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.opengroup.org/openbrand/register/">"UNIX(R) Certified Products - The Open Group official register of UNIX Certified Products"</a>. <a href="The_Open_Group" title="The Open Group">The Open Group</a>.</cite>

</li>

<li id="cite_note-54"><a href="#cite_ref-54">^</a> <cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.opengroup.org/openbrand/register/index2.html">"The Open Brand - The full register of certified products"</a>. <a href="The_Open_Group" title="The Open Group">The Open Group</a>.</cite>

</li>

<li id="cite_note-UNIX_93-55">^ <a href="#cite_ref-UNIX_93_55-0">a</a> <a href="#cite_ref-UNIX_93_55-1">b</a> <cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.opengroup.org/openbrand/register/xt.htm">"The Open Brand Register, UNIX 93"</a>. <a href="The_Open_Group" title="The Open Group">The Open Group</a>.</cite>

</li>

<li id="cite_note-UNIX_95-56">^ <a href="#cite_ref-UNIX_95_56-0">a</a> <a href="#cite_ref-UNIX_95_56-1">b</a> <cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.opengroup.org/openbrand/register/xu.htm">"The Open Brand Register, UNIX 95"</a>. <a href="The_Open_Group" title="The Open Group">The Open Group</a>.</cite>

</li>

<li id="cite_note-UNIX_98-57">^ <a href="#cite_ref-UNIX_98_57-0">a</a> <a href="#cite_ref-UNIX_98_57-1">b</a> <cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.opengroup.org/openbrand/register/xx.htm">"The Open Brand Register, UNIX 98"</a>. <a href="The_Open_Group" title="The Open Group">The Open Group</a>.</cite>

</li>

<li id="cite_note-UNIX_03-58">^ <a href="#cite_ref-UNIX_03_58-0">a</a> <a href="#cite_ref-UNIX_03_58-1">b</a> <cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.opengroup.org/openbrand/register/xy.htm">"The Open Brand Register, UNIX 03"</a>. <a href="The_Open_Group" title="The Open Group">The Open Group</a>.</cite>

</li>

<li id="cite_note-UNIX_V7-59">^ <a href="#cite_ref-UNIX_V7_59-0">a</a> <a href="#cite_ref-UNIX_V7_59-1">b</a> <cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.opengroup.org/openbrand/register/xv7.htm">"The Open Brand Register, UNIX V7"</a>. <a href="The_Open_Group" title="The Open Group">The Open Group</a>.</cite>

</li>

<li id="cite_note-60"><a href="#cite_ref-60">^</a> <cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://unix.org/unixv7.html">"The UNIX System -- UNIX V7 Certification"</a>. unix.org.</cite>

</li>

<li id="cite_note-61"><a href="#cite_ref-61">^</a> <cite id="CITEREFThe_Open_Group" class="citation web cs1">The Open Group. <a rel="nofollow" class="external text" href="https://www.opengroup.org/openbrand/register/brand3637.htm">"UNIX 03, AIX"</a>.</cite>

</li>

<li id="cite_note-62"><a href="#cite_ref-62">^</a> <cite id="CITEREFThe_Open_Group" class="citation web cs1">The Open Group. <a rel="nofollow" class="external text" href="https://www.opengroup.org/openbrand/register/brand3658.htm">"UNIX V7, AIX"</a>.</cite>

</li>

<li id="cite_note-2003-register-63">^ <a href="#cite_ref-2003-register_63-0">a</a> <a href="#cite_ref-2003-register_63-1">b</a> <cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20030802103246/http://www.opengroup.org/openbrand/register/">"The Open Brand - Register of Certified Products"</a>. Open Group. July 23, 2003. Archived from <a rel="nofollow" class="external text" href="http://www.opengroup.org/openbrand/register/">the original</a> on August 2, 2003. Retrieved January 23, 2022.</cite>

</li>

<li id="cite_note-64"><a href="#cite_ref-64">^</a> <cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20140727044600/http://h21007.www2.hp.com/portal/download/files/unprot/STK/HPUX_STK/impacts/i1071.html">"UNIX 2003 Standard Profile conformance"</a>. <a href="Hewlett-Packard" title="Hewlett-Packard">Hewlett-Packard</a>. Archived from <a rel="nofollow" class="external text" href="http://h21007.www2.hp.com/portal/download/files/unprot/STK/HPUX_STK/impacts/i1071.html">the original</a> on July 27, 2014. Retrieved July 22, 2014.</cite>

</li>

<li id="cite_note-65"><a href="#cite_ref-65">^</a> <cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://images.apple.com/macosx/docs/OSX_for_UNIX_Users_TB_July2011.pdf">"OS X for UNIX Users"</a> (PDF). July 2011.</cite>

</li>

<li id="cite_note-66"><a href="#cite_ref-66">^</a> <cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20070823040630/http://www.apple.com/macosx/leopard/technology/unix.html">"Mac OS X Leopard - Technology - UNIX"</a>. Leopard Technology Overview. Apple Inc. Archived from <a rel="nofollow" class="external text" href="https://www.apple.com/macosx/leopard/technology/unix.html">the original</a> on August 23, 2007. Retrieved June 11, 2007. <q>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.</q></cite>

</li>

<li id="cite_note-67"><a href="#cite_ref-67">^</a> <cite id="CITEREFThe_Open_Group" class="citation web cs1">The Open Group. <a rel="nofollow" class="external text" href="https://www.opengroup.org/openbrand/register/brand3555.htm">"Mac OS X Version 10.5 Leopard on Intel-based Macintosh computers certification"</a>. Retrieved June 12, 2007.</cite>

</li>

<li id="cite_note-68"><a href="#cite_ref-68">^</a> <cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.mail-archive.com/austin-group-l@opengroup.org/msg02006.html">"Re: was OS X version 10.7 Lion UNIX 03 certified?"</a>. www.mail-archive.com. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20200429213555/https://www.mail-archive.com/austin-group-l@opengroup.org/msg02006.html">Archived</a> from the original on April 29, 2020. Retrieved July 22, 2021.</cite>

</li>

<li id="cite_note-69"><a href="#cite_ref-69">^</a> <cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.opengroup.org/openbrand/register/apple.htm">"Open Brand"</a>. www.opengroup.org. Retrieved May 18, 2025.</cite>

</li>

<li id="cite_note-70"><a href="#cite_ref-70">^</a> <cite class="citation book cs1"><a rel="nofollow" class="external text" href="https://www.redbooks.ibm.com/redbooks/pdfs/sg247427.pdf">z/OS Version 1 Release 9 Implementation</a> (PDF) (First ed.). IBM. December 2007. pp. 4–5, 156–162. SG24-7427-00. Retrieved June 9, 2024.</cite>

</li>

<li id="cite_note-71"><a href="#cite_ref-71">^</a> <cite class="citation pressrelease cs1"><a rel="nofollow" class="external text" href="https://www.huawei.com/en/news/2016/9/huawei-kunlun-euleros-unix-certification">"Huawei KunLun EulerOS 2.0 Operating System Passes UNIX Certification"</a> (Press release). <a href="Huawei" title="Huawei">Huawei</a>. September 9, 2016. Retrieved October 29, 2016.</cite>

</li>

<li id="cite_note-euler-cert-72">^ <a href="#cite_ref-euler-cert_72-0">a</a> <a href="#cite_ref-euler-cert_72-1">b</a> <cite id="CITEREFThe_Open_Group" class="citation web cs1">The Open Group. <a rel="nofollow" class="external text" href="https://www.opengroup.org/openbrand/register/brand3622.htm">"UNIX 03, EulerOS"</a>.</cite>

</li>

<li id="cite_note-EulerOS_conformance_commands-73"><a href="#cite_ref-EulerOS_conformance_commands_73-0">^</a> <cite id="CITEREFPeng_Shen" class="citation web cs1">Peng Shen. <a rel="nofollow" class="external text" href="https://www.opengroup.org/csq/repository/norationale=1&noreferences=1&RID=huawei%252FCX1%252F1.html">"Huawei Conformance Statement: Commands and Utilities V4"</a>. The Open Group. Retrieved October 29, 2016.</cite>

</li>

<li id="cite_note-74"><a href="#cite_ref-74">^</a> <cite id="CITEREFThe_Open_Group" class="citation web cs1">The Open Group. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20161005132055/https://www.opengroup.org/openbrand/register/xt.htm">"The Open Brand - Register of Certified Products - UNIX 93"</a>. Archived from <a rel="nofollow" class="external text" href="https://www.opengroup.org/openbrand/register/xt.htm">the original</a> on October 5, 2016.</cite>

</li>

<li id="cite_note-75"><a href="#cite_ref-75">^</a> <cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.opengroup.org/openbrand/register/brand3596.htm">"The Open Brand Register of Certified Products"</a>. The Open Group. May 29, 2014. Retrieved May 29, 2014.</cite>

</li>

<li id="cite_note-inspur_conformance_statement-76"><a href="#cite_ref-inspur_conformance_statement_76-0">^</a> <cite id="CITEREFXie_Ruohong" class="citation web cs1">Xie Ruohong. <a rel="nofollow" class="external text" href="https://www.opengroup.org/csq/repository/RID=inspur%252FXY1%252F1.html">"Inspur Conformance Statement"</a>. The Open Group. Retrieved December 8, 2015.</cite>

</li>

<li id="cite_note-inspur_conformance_commands-77"><a href="#cite_ref-inspur_conformance_commands_77-0">^</a> <cite id="CITEREFXie_Ruohong" class="citation web cs1">Xie Ruohong. <a rel="nofollow" class="external text" href="https://www.opengroup.org/csq/repository/RID=inspur%252FCX1%252F1.html">"Inspur Conformance Statement: Commands and Utilities V4"</a>. The Open Group. Retrieved December 8, 2015.</cite>

</li>

<li id="cite_note-78"><a href="#cite_ref-78">^</a> <cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20030802154406/http://www.opengroup.org/openbrand/register/xu013.htm">"Silicon Graphics Inc - UNIX 95"</a>. Open Group. Archived from <a rel="nofollow" class="external text" href="http://www.opengroup.org/openbrand/register/xu013.htm">the original</a> on August 2, 2003.</cite>

</li>

<li id="cite_note-79"><a href="#cite_ref-79">^</a> <cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20030629093915/http://www.opengroup.org/openbrand/register/xu009.htm">"Register of Open Branded Products (OS/390)"</a>. Open Group. June 19, 2003. Archived from <a rel="nofollow" class="external text" href="http://www.opengroup.org/openbrand/register/xu009.htm">the original</a> on June 29, 2003.</cite>

</li>

<li id="cite_note-80"><a href="#cite_ref-80">^</a> <cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20200114100431/https://www.opengroup.org/openbrand/register/brand3642.htm">"UNIX V7 - The Open Brand Register, Oracle Corporation"</a>. <a href="The_Open_Group" title="The Open Group">The Open Group</a>. Archived from <a rel="nofollow" class="external text" href="https://www.opengroup.org/openbrand/register/brand3642.htm">the original</a> on January 14, 2020. Retrieved January 16, 2021.</cite>

</li>

<li id="cite_note-81"><a href="#cite_ref-81">^</a> <cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20050912194850/http://www.ocf.berkeley.edu/solaris/versions/solaris/2.5.1.html">"Solaris 2.5.1"</a>. Archived from <a rel="nofollow" class="external text" href="http://www.ocf.berkeley.edu/solaris/versions/solaris/2.5.1.html">the original</a> on September 12, 2005.</cite>

</li>

<li id="cite_note-82"><a href="#cite_ref-82">^</a> <cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20030629103042/http://www.opengroup.org/openbrand/register/xx001.htm">"Compaq Computer Corporation - UNIX 95"</a>. Open Group. Archived from <a rel="nofollow" class="external text" href="http://www.opengroup.org/openbrand/register/xx001.htm">the original</a> on June 29, 2003.</cite>

</li>

<li id="cite_note-83"><a href="#cite_ref-83">^</a> <cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://bugs.launchpad.net/rpm/+bug/1329914">"Bug #1329914 "No UNIX compatible pax implementation" : Bugs : RPM"</a>. Ubuntu bug tracker. June 13, 2014.</cite>

</li>

<li id="cite_note-84"><a href="#cite_ref-84">^</a> <cite class="citation cs1"><a rel="nofollow" class="external text" href="https://www.iso.org/standard/38825.html">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)</a>. Retrieved October 15, 2011.</cite>

</li>

<li id="cite_note-85"><a href="#cite_ref-85">^</a> <cite id="CITEREFJosey2005" class="citation web cs1">Josey, Andrew (August 29, 2005). <a rel="nofollow" class="external text" href="https://personal.opengroup.org/~ajosey/tr20-08-2005.txt">"Conflicts between ISO/IEC 9945 (POSIX) and the Linux Standard Base"</a>. personal.opengroup.org (Unapproved Draft).</cite>

</li>

<li id="cite_note-86"><a href="#cite_ref-86">^</a> <cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://archive.today/20121220223126/https://www.linuxbase.org/lsb-cert/productdir.php?by_lsb">"Certified Products Product Directory"</a>. The Linux Foundation. Archived from <a rel="nofollow" class="external text" href="https://www.linuxbase.org/lsb-cert/productdir.php?by_lsb">the original</a> on December 20, 2012. Retrieved December 9, 2015.</cite>

</li>

<li id="cite_note-87"><a href="#cite_ref-87">^</a> <cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20090310143649/http://developer.apple.com/documentation/Darwin/Reference/Manpages/man5/compat.5.html">"Mac OS X Manual Page for compat(5) - Mac OS X 10.3"</a>. developer.apple.com. October 23, 2005. Archived from <a rel="nofollow" class="external text" href="https://developer.apple.com/documentation/Darwin/Reference/Manpages/man5/compat.5.html">the original</a> on March 10, 2009. Retrieved May 24, 2018.</cite>

</li>

<li id="cite_note-88"><a href="#cite_ref-88">^</a> <cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://developer.apple.com/legacy/library/documentation/Darwin/Reference/ManPages/man5/compat.5.html">"compat(5) Manual Page - macOS 10.9"</a>. developer.apple.com. June 30, 2010. Retrieved May 24, 2018.</cite>

</li>

<li id="cite_note-89"><a href="#cite_ref-89">^</a> <cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20090310143649/http://developer.apple.com/documentation/Darwin/Reference/Manpages/man1/pax.1.html">"Mac OS X Manual Page for pax(1) - Mac OS X 10.3"</a>. developer.apple.com. October 23, 2005. Archived from <a rel="nofollow" class="external text" href="https://developer.apple.com/documentation/Darwin/Reference/Manpages/man1/pax.1/html">the original</a> on March 10, 2009. Retrieved November 25, 2023.</cite>

</li>

<li id="cite_note-90"><a href="#cite_ref-90">^</a> <cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20131223025351/http://www.freebsd.org/projects/c99/">"FreeBSD C99 and POSIX conformance project"</a>. FreeBSD Project. Archived from <a rel="nofollow" class="external text" href="http://www.freebsd.org/projects/c99/">the original</a> on December 23, 2013.</cite>

</li>

<li id="cite_note-91"><a href="#cite_ref-91">^</a> <code><a rel="nofollow" class="external text" href="https://www.freebsd.org/cgi/man.cgi?query=pax&sektion=1">pax(1)</a></code> – <a href="FreeBSD" title="FreeBSD">FreeBSD</a> General Commands <a href="Man_page" title="Man page">Manual</a>

</li>

<li id="cite_note-92"><a href="#cite_ref-92">^</a> <cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://pubs.opengroup.org/onlinepubs/9699919799/">"pax - portable archive interchange"</a>. The Open Group.</cite>

</li>

<li id="cite_note-93"><a href="#cite_ref-93">^</a> <code><a rel="nofollow" class="external text" href="https://www.freebsd.org/cgi/man.cgi?query=awk&sektion=1">awk(1)</a></code> – <a href="FreeBSD" title="FreeBSD">FreeBSD</a> General Commands <a href="Man_page" title="Man page">Manual</a>

</li>

<li id="cite_note-94"><a href="#cite_ref-94">^</a> <code><a rel="nofollow" class="external text" href="https://man.openbsd.org/sh.1">sh(1)</a></code> – <a href="OpenBSD" title="OpenBSD">OpenBSD</a> General Commands <a href="Man_page" title="Man page">Manual</a>

</li>

<li id="cite_note-95"><a href="#cite_ref-95">^</a> <code><a rel="nofollow" class="external text" href="https://man.openbsd.org/awk.1">awk(1)</a></code> – <a href="OpenBSD" title="OpenBSD">OpenBSD</a> General Commands <a href="Man_page" title="Man page">Manual</a>

</li>

<li id="cite_note-96"><a href="#cite_ref-96">^</a> <cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://man.minix3.org/cgi-bin/man.cgi?query=pax&apropos=0&sektion=0&manpath=Minix+3.3.0&arch=default&format=html">"pax(1)"</a>. man.minix3.org.</cite>

</li>

</ol></div></div>

<div class="mw-heading mw-heading2"><h2 id="External_links_2">External links</h2></div>

<ul><li><cite id="CITEREFAndrew_Josey2020" class="citation journal cs1">Andrew Josey (June 8, 2020). <a rel="nofollow" class="external text" href="https://www.opengroup.org/austin/papers/single_unix_faq.html">"Single UNIX Specification Frequently Asked Questions"</a>. opengroup.org. 1.12.</cite></li>

<li><a rel="nofollow" class="external text" href="https://unix.org/what_is_unix/single_unix_specification.html">The Single UNIX Specification</a>, unix.org</li>

<li>Single UNIX Specification, Version 1

<ul><li><a rel="nofollow" class="external text" href="https://pubs.opengroup.org/onlinepubs/009656599/toc.pdf">X/Open CAE Specification System Interface Definitions, Issue 4, Version 2</a>, 1994, opengroup.org</li>

<li><a rel="nofollow" class="external text" href="https://pubs.opengroup.org/onlinepubs/9695969499/toc.pdf">X/Open CAE Specification System Interfaces and Headers, Issue 4, Version 2</a>, 1994, opengroup.org</li>

<li><a rel="nofollow" class="external text" href="https://pubs.opengroup.org/onlinepubs/009656399/toc.pdf">X/Open CAE Specification Commands and Utilities, Issue 4, Version 2</a>, 1994, opengroup.org</li>

<li><a rel="nofollow" class="external text" href="https://pubs.opengroup.org/onlinepubs/009656199/toc.pdf">X/Open CAE Specification Networking Services, Issue 4</a>, 1994, opengroup.org</li></ul></li>

<li><a rel="nofollow" class="external text" href="https://publications.opengroup.org/c43x">Single UNIX® Specification, Version 1 Document Set (UNIX 95)</a>, opengroup.org – requires login to download</li>

<li><a rel="nofollow" class="external text" href="https://pubs.opengroup.org/onlinepubs/7908799/index.html">The Single UNIX Specification, Version 2</a>, 1997, opengroup.org</li>

<li><a rel="nofollow" class="external text" href="https://pubs.opengroup.org/onlinepubs/009695399/">The Open Group Base Specifications Issue 6</a>, 2004, opengroup.org</li>

<li><a rel="nofollow" class="external text" href="https://pubs.opengroup.org/onlinepubs/9699919799.2008edition/">The Open Group Base Specifications Issue 7, 2008 edition</a>, opengroup.org</li>

<li><a rel="nofollow" class="external text" href="https://pubs.opengroup.org/onlinepubs/9699919799.2013edition/">The Open Group Base Specifications Issue 7, 2013 edition</a>, opengroup.org</li>

<li><a rel="nofollow" class="external text" href="https://pubs.opengroup.org/onlinepubs/9699919799.2016edition/">The Open Group Base Specifications Issue 7, 2016 edition</a>, opengroup.org</li>

<li><a rel="nofollow" class="external text" href="https://pubs.opengroup.org/onlinepubs/9699919799.2018edition/">The Open Group Base Specifications Issue 7, 2018 edition</a>, opengroup.org</li>

<li><a rel="nofollow" class="external text" href="https://pubs.opengroup.org/onlinepubs/9699919799/">The Open Group Base Specifications Issue 7</a>, opengroup.org – latest edition</li>

<li><a rel="nofollow" class="external text" href="https://publications.opengroup.org/standards/unix/t101">Single UNIX Specification, Version 4, 2018 Edition</a>, opengroup.org</li>

<li><a rel="nofollow" class="external text" href="https://pubs.opengroup.org/onlinepubs/009638999/toc.pdf">X/Open Curses, Issue 4, Version 2</a>, 1996, opengroup.org</li>

<li><a rel="nofollow" class="external text" href="https://pubs.opengroup.org/onlinepubs/9699909599/toc.pdf">X/Open Curses, Issue 7</a>, 2009, opengroup.org</li>

<li><a rel="nofollow" class="external text" href="https://pubs.opengroup.org/onlinepubs/7899949299/toc.pdf">POSIX Technical Corrigendum 1</a>, 1003.1-2001/Cor 1-2001, opengroup.org</li>

<li><a rel="nofollow" class="external text" href="https://publications.opengroup.org/u130">Single UNIX Specification, Version 4 Technical Corrigendum No. 1</a>, IEEE Std 1003.1-2008/Cor 1-2013, opengroup.org</li>

<li><a rel="nofollow" class="external text" href="https://publications.opengroup.org/u160">Single UNIX Specification, Version 4 Technical Corrigendum No. 2</a>, IEEE Std 1003.1-2008/Cor 2-2016, opengroup.org</li></ul>

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</style><div id="Standards_by_The_Open_Group31" style="font-size:114%;margin:0 4em">Standards by <a href="The_Open_Group" title="The Open Group">The Open Group</a></div></th></tr><tr><td colspan="2" class="navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="ArchiMate" title="ArchiMate">ArchiMate</a></li>

<li><a href="Motif_(widget_toolkit)" class="mw-redirect" title="Motif (widget toolkit)">Motif</a></li>

<li> (<a href="POSIX" title="POSIX">POSIX</a>)</li>

<li><a href="The_Open_Group_Architecture_Framework" title="The Open Group Architecture Framework">TOGAF</a></li>

</div></td></tr></tbody></table></div>

<div class="navbox-styles"></div><div role="navigation" class="navbox" aria-labelledby="IEEE_standards209" style="padding:3px"><table class="nowraplinks hlist mw-collapsible autocollapse navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><div id="IEEE_standards209" style="font-size:114%;margin:0 4em"><a href="IEEE_Standards_Association" title="IEEE Standards Association">IEEE standards</a></div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%">Current</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="IEEE_754-2008_revision" title="IEEE 754-2008 revision">Revision</a></li></ul></li>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="IEEE_802" title="IEEE 802">802 series</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%"><a href="IEEE_802" title="IEEE 802">802</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="WiMAX" title="WiMAX">WiMAX · d · e</a></li></ul></li>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="IEEE_802.1" title="IEEE 802.1">802.1</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="IEEE_802.3" title="IEEE 802.3">802.3</a> (<a href="Ethernet" title="Ethernet">Ethernet</a>)</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="IEEE_802.11" title="IEEE 802.11">802.11</a> (<a href="Wi-Fi" title="Wi-Fi">Wi-Fi</a>)</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">

<li><a href="IEEE_802.11_(legacy_mode)" title="IEEE 802.11 (legacy mode)">legacy mode</a></li>

<li><a href="IEEE_802.11ad" title="IEEE 802.11ad">ad</a> (<a href="WiGig" title="WiGig">WiGig</a>)</li>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="IEEE_802.15" title="IEEE 802.15">802.15</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="IEEE_802.15.1" class="mw-redirect" title="IEEE 802.15.1">.1</a> (<a href="Bluetooth" title="Bluetooth">Bluetooth</a>)</li>

<li><a href="IEEE_802.15.4" title="IEEE 802.15.4">.4</a> (<a href="Zigbee" title="Zigbee">Zigbee</a>)</li>

</div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Proposed</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Superseded</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">

</div></td></tr><tr><td class="navbox-abovebelow" colspan="2"><div>

<ul><li> Category</li></ul>

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