years of AT&T's computer business, the division went through several phases of System V software groups, beginning with the Unix Support Group (USG), followed by Unix System Development Laboratory (USDL), followed by AT&T Information Systems (ATTIS), and finally Unix System Laboratories (USL).

Rivalry with BSD

In the 1980s and early-1990s, UNIX System V and the Berkeley Software Distribution (BSD) were the two major versions

1.Previous
3.Next