A little revisionist since POSIX had its seeds in 1984, which was long before the SVR4 collaboration. Giving DEC, IBM, and HP credit for POSIX is a little odd.

A little revisionist since POSIX had its seeds in 1984, which was long before the SVR4 collaboration. Giving DEC, IBM, and HP credit for POSIX is a little odd. They were actually the biggest beneficiaries of the fragmented nature of Unix, with their proprietary flavors. AIX vs HPUX vs DEC Unix all meant that Ken Olsen could pretend to support Unix and at the same time tell the world that "Unix is snake oil".