ULTRIX Guide to the Source Code Control System

This document, titled "ULTRIX Guide to the Source Code Control System" by Digital Equipment Corporation (June 1990, for ULTRIX Version 4.0 or higher), introduces the sccs(1) preprocessor and its related commands.

The guide serves as a comprehensive resource for individuals responsible for archiving source files, assuming familiarity with ULTRIX commands and text editors.

Key aspects covered include:

• Introduction to SCCS: Explains SCCS as a source management system that records changes (who, what, when, why), enables recovery of old versions, supports different versions (branches), and prevents concurrent editing.
• SCCS Terminology: Defines core concepts such as the s-file (a single log file storing versions differentially), deltas (each set of changes), SCCS IDs (version numbers for deltas), and ID keywords (special markers expanded by SCCS into version information).
• Using SCCS Commands: Details practical operations like creating SCCS files (admin), getting files for compilation (get) or editing (edit), merging changes back (delta), restoring older versions (get -r, rmdel), and auditing changes (prs, sccsdiff, info, check, tell, what). It also covers combined commands for common sequences (e.g., delget, fix, unedit).
• SCCS in Project Environments: Provides guidance on setting up an SCCS directory for multi-person projects, managing file editing, recovering corrupted files, using the admin command to set file parameters, maintaining different versions through branching, and integrating SCCS with the make utility for software builds.