The PWB shell was a modified (and generally constrained to be upward-compatible) version of the Thompson shell with additional features to increase usability for programming. It was maintained by John Mashey and various others (Dick Haight, Alan Glasser).

Notable firsts in PWB include: The Source Code Control System, the first UNIX revision control system, written by Marc J. Rochkind; The remote job entry batch-submission system; The PWB shell, written by John R. Mashey, which preceded Steve Bourne's Bourne shell

Manual of the PWB (aka Mashey) Shell. released under the license of Caldera. original sh.1 (and all referenced pages) massaged, nroffed and htmlized. sh(1) doesn't contain a reference to the echo command, here it is: echo(I).

PWB/UNIX (usually called just 'PWB; the acronym is from its formal name, the 'Programmer's Workbench') was a variant of early UNIX (initially V6 Unix) inside Bell Labs, with minor changes to the kernel make it more suitable for use in a production environment (e.g. better response to resource exhaustion, both disk and processing power); minor ...

Dec 26, 2014 · The original Unix shell was the Thompson shell. There was also a derivative of it called the PWB shell. (Source: Historic Unix shells at Wikipedia)

He worked on the PWB/UNIX operating system at Bell Labs from 1973 to 1983, authoring the PWB shell, also known as the "Mashey Shell". [4] He then moved to Silicon Valley to join Convergent Technologies, ending as director of software. [5]

Feb 16, 2023 · Notable “firsts” in PWB include SCCS, the remote job entry batch-submission system RJE, the PWB shell, written by John R. Mashey, which preceded the Bourne shell, lex and yacc, and utilities like find, cpio, expr, xargs, egrep and fgrep.

The PWB shell was a modified (and generally constrained to be upward-compatible) version of the Thompson shell with additional features to increase usability for programming. It was maintained by John Mashey and various others (Dick Haight, Alan Glasser).

How to identify a traditional Bourne shell? 1 A simple check for an often undocumented but characteristic feature: You can use the circumflex ^ (caret) as replacement for | (pipe). This was inherited from the predecessor, the Thompson shell, probably for reasons of convenience on early upper-case-only terminals.

Dec 1, 2023 · (This shell is sometimes called the Mashey shell, but the version you can find described in Wikipedia as the 'PWB shell' is rather more elaborate than the V6 sh manual page describes or the V6 sh.c seems to implement.)