Since Apple spent so much effort in getting certified: https://www.opengroup.org/openbrand/register/ https://www.opengroup.org/openbrand/register/ These are a

Since Apple spent so much effort in getting certified: https://www.opengroup.org/openbrand/register/ https://www.opengroup.org/openbrand/register/ These are all guaranteed to work: https://pubs.opengroup.org/onlinepubs/9699919799/utilities/ https://pubs.opengroup.org/onlinepubs/9699919799/utilities/ (I may not have linked to the precisely correct version.)