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==Features== Notable firsts in PWB include: * The [[Source Code Control System]], the first UNIX [[revision control]] system, written by [[Marc Rochkind|Marc J. Rochkind]] * The [[remote job entry]] batch-submission system * The [[PWB shell]], written by [[John R. Mashey]], which preceded [[Stephen R. Bourne|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 (Unix)|find]], [[cpio]], [[expr]], all three written by Dick Haight, [[xargs]], [[grep#Implementations|egrep]] and fgrep * [[yacc]] and [[lex programming tool|lex]], which, though not written specifically for PWB, were available outside of Bell Labs for the first time in the PWB distribution
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