Complete REXX programming

Description

REXX training course description

A hands on training course covering the Restructured EXtended eXecutor (REXX) language. A large number of exercises are used to reinforce and emphasise lecture sessions.

What will you learn

• Write REXX programs.
• Debug REXX programs.
• Examine existing code and determine its function.

REXX training course details

REXX training course contents

• Introduction to REXX

What is REXX? REXX environments, invoking a REXX exec, a sample REXX exec, REXX clause types.

• REXX variables and data

Literal data, variable data, assignment, simple variables, compound variables, stem variables, constant data, numeric data, arithmetic operations, character manipulation, hexadecimal data.

• The parse instruction

Parse format, Parse examples, Parse arg, Parse pull, Parse value, special templates, place holders, literal templates, numeric templates, variable templates.

• Control structures

Relational conditions, logical operators, simple selection, looping: uncontrolled and controlled loops, infinite loops, conditional loops, controlling loops, leave, iterate, multiple selection, instructions for subroutines, exit.

• Sub routines and functions

Internal and external subroutines, call, ARG(), ARG(n)return, exit, scope of variables, procedure, functions, built in functions, overriding built in functions.

• Performing I/O

Command conventions, preparing to read a file, execio, limitations, execio for reading, DISKR, DISKRU, DISKW, return codes.

• External functions

listdsi, msg, outtrap, prompt, sysdsn, sysvar, storage

• Tracing

Immediate commands, the trace facility, signal and call statements.

• Built in functions

Text handling functions, string handling, word handling, arithmetic, data conversion, bit manipulation, environment.

• The data stack

Data stack structure, REXX instructions for the data stack, REXX functions for the data stack, TSO/E commands for the data stack.

• REXX in batch

TSO/E foreground. TSO/E background.