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 See also Research Unix Writer's Workbench ("WWB") References External links Unix ad mentioning PWB, from a 1981 issue of Datamation (on Dennis Ritchie's homepage) PWB distributions, from the Ancient UNIX Archive Unix history Unix variants Bell Labs Unices