REXX Functions for TSO Users

The REXX programming language comes with a set of built-in functions designed to streamline the programming process. These REXX Functions allow for effortless manipulation of data strings and arithmetic operations, reducing the programming effort required. This book provides an in-depth exploration of 78 REXX functions specifically applicable to your z/OS TSO REXX programs.

At its core, a function is an intrinsic feature of the REXX language, readily accessible whenever you are coding. They offer a straightforward method for handling data strings and performing calculations. Utilizing these functions enhances programming efficiency and reliability since they have been developed and rigorously tested by IBM, the software manufacturer.

The Index within this book is designed differently from standard indexes that merely list language features alphabetically. Traditional indexes can be challenging when you are unsure of a feature's name. Instead, this custom index presents common English names for REXX functions. For example, searching for “Convert decimal number” will direct you to its REXX equivalent, D2C, allowing you to utilize the function without knowing its specific terminology beforehand.

Clear and straightforward examples illustrate various methods to invoke and implement REXX functions within your programs. To assist you in locating the desired function, one entire chapter is dedicated to a categorized listing based on the purpose of each function.

Every built-in function is presented in detail, accompanied by practical usage examples, and arranged alphabetically for easy reference. Additionally, I have included several supplementary chapters to enhance the experience of REXX programmers:

1. Writing REXX Macros: A guide on creating reusable code to simplify complex tasks.
2. Compatibility Issues across Platforms: Insights into how REXX functions adapt across different environments.
3. Precedence of Operators: An overview of how REXX prioritizes operations in complex expressions.
4. Executing TSO Commands: Instructions on running TSO commands in various contexts, including Native Mode (Ready Mode), ISPF Option 6, command line usage on ISPF panels, and within batch jobs.
5. Specifying Dataset Names: Guidance on naming conventions for datasets in TSO commands, REXX, and CLISTs to ensure proper referencing.
6. Commonly Used TSO Commands in REXX: A compilation of TSO commands arranged by their functionality, complete with clear examples to facilitate understanding.

In summary, this book serves as a comprehensive resource for anyone looking to harness the power of REXX in their programming endeavors. With detailed explanations, practical examples, and a user-friendly index, you will find it easier than ever to navigate the world of REXX programming and maximize your programming efficiency. Whether you are a novice or an experienced programmer, the insights and practices shared here will enhance your ability to write effective REXX code.

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