The PWB shell (also known as the Mashey shell) was an early Unix shell.
Distributed with some versions of Programmer's Workbench UNIX circa 1975-1977, it was a modified (and generally constrained to be upward-compatible) version of the Thompson shell with additional features to increase usability for programming, and was maintained by John Mashey and various others (Dick Haight, Alan Glasser).
Read more about PWB Shell: Notable Features, Descendants
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