# Part IV. Software Development

The Unix operating system earned its reputation by providing an unexcelled environment for software development. SCCS, RCS, and `make` are major contributors to the efficiency of this environment. SCCS and RCS allow multiple versions of a source file to be stored in a single archival file. `make` automatically updates a group of interrelated programs.

- Chapter 18, The Source Code Control System

- Chapter 19, The Revision Control System

- Chapter 20, The make Utility

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