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Introduction to REXX
Programming
Overview
This 2 day course is designed to give the delegates an introduction to
the REXX programming language. It will provide them with knowledge
required to write, test and execute progressively more difficult REXX
Programs on VM. The course is a mix of lectures and practical
exercises. For programmers who are new to REXX this course should be
taught in conjunction with the CMS Pipelines
Class which covers I/O on the VM System.
Pre-requisites
An understanding of structured programming techniques is useful.
Audience
Staff who would like to automate repetitive tasks on VM.
Student
Numbers
The
maximum recommended student to instructor ratio is 12:1
Objectives
By the end of the course, the delegates will be able, with the aid of
course notes to:
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Code REXX Execs, using loops, if/else statements
and subroutines.
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Debug Execs using the REXX Trace facility.
·
Pass arguments to an Exec from the command line,
or pull data from the user.
·
Use REXX functions to process data and variables.
Course Outline
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Introduction
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Introduction
to the Exec languages and REXX
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Variables
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Declaring
Variables
Assigning values to a variable
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Tracing
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The
REXX Trace facility
Interactive Trace
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Output
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Output
to the Screen
Screen Alignment using left/right/centre
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Arguments
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How
an Exec ask a question - using Pull
Accepting arguments
Introducing parse
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Program
Structure
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if
statement
subroutines
checking conditions
looping
The Case structure
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REXX
Functions
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Introduction
to Functions
Nested functions
The right function for the job
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Miscellaneous
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The
Stack- Pushing & Pulling
STATE command
Array processing
Parsing data
Interfacing with XEDIT macros (if required)
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