Comment by hmage
> macOS is a ... non-UNIX
Seems to be badly phrased and meant something else, since macOS is certified to be UNIX - https://www.opengroup.org/openbrand/register/ - contrary to Linux which is not UNIX-certified.
HN posted about this at least once - https://news.ycombinator.com/item?id=29984016
UNIX is/whas a commercial product from AT&T. macOS is UNIX-certified. Not the same thing.