macOS is not a UNIX-based operating system. It used to be marketed as "UNIX" but... | Hacker News

Hacker Newsnew | past | comments | ask | show | jobs | submit

		thebitstick on Nov 4, 2022 \| parent \| context \| favorite \| on: FreeBSD optimizations used by Netflix to serve vid... macOS is not a UNIX-based operating system. It used to be marketed as "UNIX" but only because it met the Open Group's POSIX standards.

yehaaa on Nov 4, 2022 [–]

Not only does macOS comply to the POSIX standard, it also is a fully certified UNIX system.

https://www.opengroup.org/openbrand/register/brand3683.htm

Consider applying for YC's Summer 2026 batch! Applications are open till May 4
Guidelines | FAQ | Lists | API | Security | Legal | Apply to YC | Contact