The other day I was looking up Unix find command on Wikipedia (https://en.wikipedia.org/wiki/Find_(Unix) https://en.wikipedia.org/wiki/Find_(Unix)). It lead me

The other day I was looking up Unix find command on Wikipedia (https://en.wikipedia.org/wiki/Find_(Unix) https://en.wikipedia.org/wiki/Find_(Unix)). It lead me down a rabbit hole to a project called Programmer's Workbench (https://en.wikipedia.org/wiki/PWB/UNIX https://en.wikipedia.org/wiki/PWB/UNIX). 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 The restricted shell (rsh), an option of the PWB shell, used to create widely-available logins for status-checking, trouble-reporting, but made safe by restricting commands The troff -mm (memorandum) macro package, written by John R. Mashey and Dale W. Smith Utilities like find, cpio, expr, all three written by Dick Haight, xargs, egrep and fgrep yacc and lex, which, though not written specifically for PWB, were available outside of Bell Labs for the first time in the PWB distribution Amazing.