PWB/UNIX PWB shell PWB Research Unix CB UNIX Version 6 Unix UNIX System III Version 7 Unix Unix Csplit Unix shell History of Unix Rudd Canaday John Mashey Thompson shell Bs (programming language) Man page List of Unix systems Uname Workbench (disambiguation) C date and time functions List of POSIX commands Echo (command) Remote Shell Source Code Control System Cpio Make (software) Writer's Workbench Berkeley DB List of operating systems Environment variable Comparison of file systems PerkinElmer NEC V60 Comparison of version-control software List of programmers Bell Labs