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The Programmer's Workbench (PWB/UNIX) is an early, now discontinued, version of the Unix operating system created in the Bell Labs Computer Science Research Group of AT&T. Its stated goal was to provide a time-sharing working environment for large groups of programmers, writing software for larger batch processing computers.[1]

Prior to 1976 Unix development at AT&T was a project of a small group of researchers in Department 1127 of Bell Labs. As the usefulness of Unix in other departments of Bell Labs was evident, the company decided to develop a version of Unix tailored to support programmers in production work, not just research. The Programmer's Workbench was started in 1973,[2] by Evan Ivie and Rudd Canaday to support a computer center for a 1000-employee Bell Labs division, which would be the largest Unix site for several years. PWB/UNIX was to provide tools for teams of programmers to manage their source code and collaborate on projects with other team members. It also introduced several stability improvements beyond Research Unix,[3] and support for the nroff and troff text formatters.[4]

While PWB users managed their source code on PDP-11 Unix systems, programs were often written to run on other legacy operating systems. For this reason, PWB included software for submitting jobs to IBM System/370, UNIVAC 1100 series, and XDS Sigma 5 computers. In 1977 PWB supported a user community of about 1100 users in the Business Information Systems Programs (BISP) group of Bell Labs.[3][4]

Two major releases of Programmer's Workbench were produced. PWB/UNIX 1.0, released July 1, 1977 was based on Version 6 Unix; PWB 2.0 was based on Version 7 Unix. The operating system was advertised by Bell System Software as late as 1981[5] and edition 1.0 was still on an AT&T price list for educational institutions in 1984.[6] Most of PWB/UNIX was later incorporated in the commercial UNIX System III and UNIX System V releases.


Notable firsts in PWB include:


  1. ^ T.A. Dolotta; J.R. Mashey (1976). An introduction to the Programmer's Workbench. Proc. 2nd Int'l Conf. on Software Engineering. pp. 164–168. 
  2. ^ John R. Mashey (2004). Languages, Levels, Libraries, and Longevity. ACM Queue 2 (9).
  3. ^ a b T.A. Dolotta; R.C. Haight; J.R. Mashey (1978), "Unix Time-Sharing System: The Programmer's Workbench" (PDF), Bell System Tech. J., 57 (6): 2177–2200, doi:10.1002/j.1538-7305.1978.tb02148.x 
  4. ^ a b Fiedler, Ryan (October 1983). "The Unix Tutorial / Part 3: Unix in the Microcomputer Marketplace". BYTE. p. 132. Retrieved 30 January 2015. 
  5. ^ Dennis M. Ritchie. "Unix Advertising". former Bell Labs Computing and Mathematical Sciences Research. Archived from the original on 2 January 2013. Retrieved 17 February 2014. 
  6. ^ "Software List for UNIX System V" (PDF). 1 September 1983. Retrieved 27 April 2014. 

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