PWB/UNIX

[Ron Natalie]

Off the top of my head, which is probably wrong, PWB UNIX (Programmers
Workbench) saw the light of day (out side of ATT) around 1978 and was
developed by the group that eventually evolved into the people who
were responsible for PWBII, System 3, and System V.  It's main raison
d'etre was the enhanced ability to keep track of programs to be down
loaded to other computer environments (like IBM RJE).  SCCS has it's
roots here.  Originally it was a slightly bug fixed V6 kernel with
a couple of enhancements (like the empty() system call) and featured
a few extra niceties like the PWB shell, which was distinguished from
the existing shell by having things like shell variables and a user
setable path.

-Ron