> as normal for a Unix

veering offtopic, did you know macOS is a certified Unix?

https://www.opengroup.org/openbrand/register/brand3581.htm

As I recall, Apple advertised macOS as a Unix without such certification, got sued, and then scrambled to implement the required features to get certification as a result. Here's the story as told by the lead engineer of the project:

https://www.quora.com/What-goes-into-making-an-OS-to-be-Unix...