Command Definition, Librarian, and Message Utilities Manual

This manual provides detailed technical information for three essential OpenVMS utilities:

• Command Definition Utility (CDU): Explains how to create, modify, and manage command definition files that allow the DIGITAL Command Language (DCL) to parse user commands and execute corresponding images or routines. It covers syntax definitions, value types, and how to define commands for user-written applications.

• Librarian Utility (LIBRARIAN): Describes the creation and maintenance of various library types, including object, macro, help, text, and shareable image libraries. It details utility functions such as adding, deleting, and extracting modules, as well as managing library structures for optimal storage.

• Message Utility (MESSAGE): Details how to build custom system messages, including construction of message source files, compilation into object modules, and linking to applications. It also explains the use of message pointers for managing multi-lingual or application-specific message text.

The document includes extensive reference material on commands, qualifiers, directives, and examples for each utility.