IBM-REXX Tutorial

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What is IBM Rexx tutorial?

IBM Rexx (Restructured Extended Executor) is developed as a scripting language. The main objective of this language is to make scripting as easy, fast, reliable, and error-free as possible. Rexx is designed as a powerful, and easy to use. It is used for developing small programs to apply text file transformations. This tutorial provides the coverage of Rexx concepts and how to deal with different components and sub-components.

Audience

This tutorial is prepared for the professionals in the IT industry who are working in the field of Scripting and Macro Languages. It is useful for the professionals who works in Data Processing, text and also for generating reports.

Prerequisites

This is a basic tutorial and it is must to know the concepts of scripting languages and programs. Having knowledge on prior exposure on programming languages, data processing, and generating reports.

IBM-REXX Tutorial: List of Topics

• Introduction
  • What The Saa Solution Is
  • Benefits Of Using A Compiler
• Rexx General Concepts
  • Structure And General Syntax
  • Expressions And Operators
  • Clauses And Instructions
  • Assignments And Symbols
  • Commands To External Environments
• Keyword Instructions
  • Address
  • Arg
  • Call In Rexx
  • Dodo Groups Instructions
  • Drop
  • Exit
  • If
  • Interpret
  • Iterate
  • Leave
  • Nop
  • Numeric
  • Special Character Sets In Rexx
  • Parse
  • Procedure
  • Pull
  • Push
  • Queue Expression
  • Return Statement In Rexx Program
  • Say
  • Select
  • Signal
  • Trace
  • Upper
• Functions
  • Syntax- Function Call
  • Functions And Subroutines
  • Built-in Functions In Rexx
  • Tso/e External Functions
• Parsing
  • Simple Templates For Parsing Into Words
  • Parsing With Variable Patterns
  • Using Upper
  • Parsing Instructions Summary
  • Parsing Instructions Examples
  • Advanced Topics In Parsing
• Numbers And Arithmetic
  • Character Strings In Rexx
  • Definition Of The Rexx Language
• Conditions And Condition Traps
  • Action Taken When A Condition Is Not Trapped
  • Action Taken When A Condition Is Trapped
  • Condition Information
  • Special Variables Rc
• Using Rexx In Different Address Spaces
  • Additional Rexx Support
  • Writing Execs That Run In Non-tso/e Address Spaces
  • Running An Exec In A Non-tso/e Address Space
  • Writing Execs That Run In The Tso/e Address Space
  • Running An Exec In The Tso/e Address Space
  • Summary Of Writing Execs For Different Address Spaces
• Reserved Keywords, Special Variables, And Command Names
  • Reserved Keywords
  • Special Variables-ibm Rexx
  • Reserved Command Names
• Tso/e Rexx Commands
  • Delstack
  • Dropbuf
  • Execio
  • Executil
  • He
  • Hi
  • Ht
  • Immediate Commands
  • Makebuf
  • Newstack
  • Qbuf
  • Qelem
  • Qstack
  • Rt
  • Subcom
  • Te
  • Ts
• Debug Aids
  • Interactive Debugging Of Programs
  • Interrupting Execution And Controlling Tracing
• Tso/e Rexx Customizing Services
  • Flow Of Rexx Exec Processing
  • Overview Of Replaceable Routines
  • Exit Routines
• Language Processor Environments
  • Overview Of Language Processor Environments
  • Using The Environment Block
  • When Environments Are Automatically Initialized In Tso/e
  • When Environments Are Automatically Initialized In Mvs
  • Types Of Environments – Integrated And Not Integrated Into Tso/e
  • Characteristics Of A Language Processor Environment
  • Flags And Corresponding Masks
  • Module Name Table
  • Host Command Environment Table
  • Function Package Table
  • Values Provided In The Three Default Parameters Modules
  • How Irxinit Determines What Values To Use For The
    Environment
  • Chains Of Environments And How Environments Are Located
  • Changing The Default Values For Initializing An Environment
  • Specifying Values For Different Environments
  • Control Blocks Created For A Language Processor Environment
  • Changing The Maximum Number Of Environments In An Address Space
  • Using The Data Stack In Different Environments
• Initialization And Termination Routines
  • Initialization Routine – Irxinit
  • Termination Routine – Irxterm
• Replaceable Routines And Exits
  • Replaceable Routines
  • Exec Load Routine
  • Input/output Routine
  • Host Command Environment Routine
  • Data Stack Routine
  • Storage Management Routine
  • User Id Routine
  • Message Identifier Routine
  • Rexx Exit Routines