Single UNIX Specification: Difference between revisions

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====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/[e-mail]/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/[e-mail]/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=20222025-1105-1518 |website=www.opengroup.org}}</ref>

====Xinuos====

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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, the [[pax (command)|pax]] command is usually not installed; furthermore, the pax command packages available for Linux often lack the 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> The FreeBSD pax command, derived from 4.4BSD, does not fully support the 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 the 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.

== External links ==