The Programmer's Workbench (PWB/UNIX) was an early, now discontinued, version of the Unix operating system that had been created in the Bell Labs Computer
The PWB shell (also known as the Mashey shell) was a Unix shell. The PWB shell was a modified (and generally constrained to be upward-compatible) version
from February 18, 1977. It was available with the Programmer's Workbench (PWB) edition of the operating system. Release 4 of SCCS was the first version
first ever commercially sold Unix version, INTERACTIVE's IS/1. Bell's own PWB/UNIX 1.0 was also based on V6, where earlier (unreleased) versions were based
the number of libraries significantly. make – build manager (introduced in PWB/UNIX), for effectively automating the build process include – header files