Mainframe Training : REXX Programming

REXX Programming

Mainframe Training Overview

This is an introductory class to the REXX programming environment. It is intended for those new to REXX programming and covers all the fundamentals of the language

Mainframe Training Audience

Anyone with a need or desire to learn and understand the REXX programming language. Familiarity with TSO/ISPF is required.

Mainframe Training Course duration

3 Days

Mainframe Training Course outline

Overview

Terminology

Data structures

Running REXX programs under TSO/E

Establishing libraries
Invoking REXX procedures
Terminating REXX procedures

Writing the first REXX procedure

External Data Queue (EDQ) - Data stack
PARSE/PULL keywords
QUEUED() built-in function
TRACE diagnostics

Expressions and Operators

The REXX expression
Operators
- Arithmetic
- Comparison
- Logical

Assignments and Variables

Dealing with variables
PARSING
Stem Variables

Conditional and Loop Logic

IF THEN ELSE
DO Loops

Subroutines and Functions

Internal vs external routines
PROCEDURE/EXPOSE clause
Recursion

Built-in Functions

REXX built-in functions

Additional Keyword clauses

PARSE clauses
DROP/NOP

TSO/E Built-in Functions

OUTTRAP()
LISTDSI()
SYSVAR()
MVSVAR()

FILE I/O

Using EXECIO