Editing Single UNIX Specification (section)

====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>