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REXX Scripts in the z/OS Environment

Course content updated by LearnQuest
Price
1,755 USD
3 Days
MFRX-110
Classroom Training, Online Training
IBM Business Partner
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  • Date: 28-Feb-2022 to 2-Mar-2022
    Time: 9AM - 5PM US Eastern
    Location: Virtual
    Language: English
    Delivered by: LearnQuest
    Price: 1,755 USD
  • Date: 28-Mar-2022 to 30-Mar-2022
    Time: 9AM - 5PM US Eastern
    Location: Virtual
    Language: English
    Delivered by: LearnQuest
    Price: 1,755 USD
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Course Description

Overview

This REXX course is for those wanting to learn and master REXX in the z/OS environment. Students will study the REXX interpreter as a basis for understanding techniques for writing efficient and readable REXX code. Templates, tracing, and interpreting are reviewed as well as Generic built-in functions. During workshops, students will test REXX in a variety of commonplace application scenarios. Students will learn how to create their own subroutines and functions. Terminal output will be trapped from z/OS and TSO/E. Techniques will be presented to manage the program stack, along with file I/O. Familiarity with TSO/E, ISPF, and ISPF Editor is required. Experience with JCL is beneficial but not mandatory.

 

This course is one step in the following Learning Journey:

  1. Mainframe Application Developer

Objectives

Upon completion of the REXX course, students will be able to:
  • Write efficient, readable REXX code
  • Choose between various REXX templates for parsing
  • Exploit INTERPRET and interactive debug TRACE
  • Create their own built in REXX functions
  • Trap console output from MVS and TSO/E
  • Effectively manage the program stack
  • Read, write, and update MVS files
  • Submit MVS REXX execs to MVS batch processor

Audience


 

Prerequisites


     

Topics

  • Why REXX?
    • History, Advantages, Disadvantages
    • What is REXX like?
    • What Can REXX do?
    • REXX on TSO
    • Comparison with CLISTs
    • Execution Differences: CLIST and REXX
    • REXX Syntax
    • Setting up to Execute
  • REXX Components
    • REXX Verbs and Keywords
    • Assignment
    • Command
    • Label
    • Function
    • The Literal
    • Hexadecimal String
    • REXX Variables
    • The Basic Subset
  • Concatenation and Logic
    • Concatenating Data IF – The Conditional Comparison Operators
    • The DO END Construction
    • Fuzzing: Not Quite EqualBoolean Operators
  • String Manipulation With Parse
    • Parse
    • Function of Parsing
    • Parse Origin
    • Parsing in a Main Program
    • ARG and DATASET Names
    • Converting CLIST PROC to REXX ARG
    • Parsing Arguments in a Function
    • Subroutine
    • Parsing From The Stack and Terminal
    • Parsing From Terminal Only
    • Parsing a Variable
    • Parsing a Literal Value
    • Parse Source
  • Debugging
    • What You Can Do During Interactive
    • Debug
    • Interactive Debug Codes
    • Debugging
    • Tracing Instructions
    • Trapping Errors
    • The Trap That Terminates
    • The Trap That Continues
    • Trap Continues with Chosen Name
    • Condition
    • Trapping TSO/ISPF Command
    • Trapping Failure
    • Failure Trap That Continues
    • Trapping Novalue
    • Trapping PA1 or ATTN
    • Trapping With A Choice
    • Trap Ingredients
    • The Infamous “GO TO”
  • Arithmetic
    • Math
    • Precision
    • Rounding
  • Select CASE Structure
    • Select: CASE Structure
    • Select Example
    • Select and NOP
    • Select and OTHERWISE
  • Passing Commands to the Environment
    • General
    • When REXX Will Pass Command to the Environment
    • How REXX Decides
    • What Environments Can REXX Talk To?
    • When Can REXX Work with TSO, ISPF, ISPF Editor?
    • What is the Normal Default Environment?
    • Passing One Command to an Environment
    • Is an Environment Available? Talking to ISPF
    • Using Variable Services
    • File Tailoring Services
    • File Tailoring Example
    • File Tailoring Panel
    • File Tailoring
    • Edit Macro
    • Edit Macro Environment and Parms
    • Edit Macro with Multiple Parms
    • Edit Macros with Variables
  • Built-in FUNCTIONS
    • Using RESULT
    • Using Null with Functions
    • DATATYPE Function
    • LENGTH Function
    • POS Function
    • QUEUED Function
    • SUBSTR Function
    • X2D and D2X Functions
    • Functions Found Only on TSO
    • LISTDSI Function
    • LISTDSI Example
    • MSG Function
    • OUTTRAP Function
    • OUTTRAP Example
    • SYSDSN Function
    • User Written Functions/Subroutines
    • General Format of Internal Function/Subroutine
    • External Functions/Subroutines
  • Looping
    • DO WHILE
    • DO UNTIL
    • Stepping with DO
    • DO FOREVER
    • Looping N Times
    • DO n TIMES
    • ITERATE
    • LEAVE
  • REXX – The Stack
    • What is the Stack?
    • How Do You Put Thing Into the Stack?
    • How Do You Take Things From the Stack?
    • Description of the Stack
    • Data in the Stack
    • Terminal Input
    • QUEUE and EXECIO
    • PUSH and the Stack
    • Removing Data from the Stack
    • Counting Lines in the Stack
    • Bypassing the StackBottom of the Stack
    • Sending the Stack to TSO
    • Isolating the Stack
    • NEWSTACK
    • Functions Used with the Stack
    • Clearing the Stack
    • Passing Information to Another Program
  • Compound Variables
    • What is a Compound Variable?
    • Compound Variable Example
    • Compound Variables and Subscripts
    • What are Compound Variables Used For?
    • Stepping Through the Extensions
    • Loading and Unloading an Array
    • Changing the Stem
    • Using Two or More Extensions
  • EXECIO
    • EXECIO
    • EXECIO Format
    • What Do You Read Into?
    • Where Do You Write From?
    • EXECIO Syntax
    • Reading a Whole File into the Stack
    • Reading One Record at a Time
    • Reading One Record
    • Reading a Whole File into an Array
    • Additional Option for Reading
    • EXECIO Writing
    • Writing from the Stack Example
    • Writing from the Stack Explanation
    • Copy a File Using the Stack
    • Writing from an Array
    • The INTERPRET Instruction
  • APPENDIX
    • Converting from CLISTS
    • Codes Displayed During Interactive Debug
    • Tracing Instruction You Can Put in Your Programs
  • 2020 Top 20 Training Industry Company - IT Training

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