macOS, as shipped, is only Unix-like. Even when configured to pass UNIX certification, it doesn't qualify without the temporary waivers:
if you want your installation of macOS 15.0 to pass the UNIX® 03 certification test suites, you need to disable System Integrity Protection, enable the root account, enable core file generation, disable timeout coalescing, mount any APFS partitions with the strictatime option, format your APFS partitions case-sensitive (by default, APFS is case-insensitive, so you’ll need to reinstall), disable Spotlight, copy the binaries uucp, uuname, uustat, and uux from /usr/bin to /usr/local/bin and the binaries uucico and uuxqt from /usr/sbin to /usr/local/bin, set the setuid bit on all of these binaries, add /usr/local/bin to your PATH before /usr/bin and /usr/sbin, enable the uucp service, and handle the mystery issues listed in the four Temporary Waivers. [1]
Maybe your installation of macOS is technically Unix, but mine sure as hell ain't. Desktop "Unix" in 2026 is little more than lipstick on a pig anyhow.
alt Hacker News
macOS, as shipped, is only Unix-like. Even when configured to pass UNIX certification, it doesn't qualify without the temporary waivers:
Maybe your installation of macOS is technically Unix, but mine sure as hell ain't. Desktop "Unix" in 2026 is little more than lipstick on a pig anyhow.[1] https://www.osnews.com/story/141633/apples-macos-unix-certif...