z/OS REXX Programming

This 5 day class will introduce students to the skills necessary to code REXX execs in
z/OS and OS/390 environments.  The student will learn to:

•  Create and allocate REXX libraries.
• Invoke REXX execs and pass parameters to them.
• Use REXX instructions to perform terminal I/O.
• Perform arithmetic calculations and character
  operations.
• Use such REXX programming constructs as: IF statements, SELECT‑WHEN constructs and DO‑WHILE and iterative DO loop sequences.
• Debug REXX execs via the TRACE facility.
• Write user‑developed REXX subroutines and
  functions.
• Issue TSO commands from REXX execs.
• Trap TSO command output and process the output
  in the REXX exec.
• Use ISPF services in REXX execs.
• Parse data using the PARSE statement.
• Read and write sequential datasets.
• Manipulate and access the REXX data stack.
• Create REXX‑based ISPF edit macros.
• Execute REXX execs in batch jobs.
• Write REXX execs that interact with DB2.
• Write REXX execs that issue MVS operator
  commands.
• Compile and linkedit REXX execs.

A series of written and lab exercises will be used to reinforce the classroom
education.

Audience

Programmer, technical support personnel, and other individuals that need to write REXX execs.

Prerequisites

• Introduction to OS/390, Introduction to z/OS, or
  equivalent experience.
• TSO/ISPF, or equivalent experience.
• Previous experience in designing and coding
  application programs will enhance the results of this course.

Introduction to REXX

• Definition
• Dataset Organization
• Methods of Execution

REXX Language Syntax

• General Statement Syntax
• Variables
• Assignment Statement
• Accessing the Terminal
  • SAY Statement
  • PULL Statement
  • ARG Statement
  • IF‑THEN‑ELSE Statement
  • SELECT‑WHEN Sequence
  • AIterative DO Sequence
  • DO‑WHILE‑END Sequence
  • DO‑UNTIL Sequence
  • DO FOREVER Sequence
  • LEAVE Statement
  • ITERATE Statement
  • SIGNAL Statement
  • EXIT Statement

REXX Built-in Functions

• Information Functions
• Character Functions
• Word Functions
• Data Functions

 Debugging REXX Execs

• TRACE Statement
• Interactive Tracing
• Condition Traps

User‑defined Subroutines and Functions

• Defining and Using Subroutines
• Defining and Using Functions
• Internal versus External Functions

TSO/E Processing in REXX

• Using TSO Commands
• TSO/E External Functions
  • SYSVAR( )
  • MVSVAR( )
  • MSG( )
  • PROMPT( )
  • SYSDSN( )
  • LISTDSI( )
  • OUTTRAP( )

Using ISPF Services in REXX

• BROWSE / VIEW Services
• EDIT Service
• LIBDEF Service
• DISPLAY Service
• SETMSG Service
• ADDRESS Statement
• SUBCOM Command

Parsing Data

• PARSE Statement
• List Parsing
• String Pattern Parsing
• Positional Pattern Parsing

File I/O

• Executing Programs in Execs
  • ALLOC Command
  • CALL Command
  • FREE Command
  • EXECIO Statement

Data Stack Processing

• Definition
• REXX Statements to Manipulate the Stack
• Uses of the Stack in REXX Execs
• TSO Commands That Use the Stack

ISPF Edit Macros

• Overview
• Edit Macro Commands
• Using Edit Primary Commands
• Using Edit Line Commands
• Using Edit Macro Keyphrases
• Using Edit Labels

Batch REXX Execution

• Executing REXX Execs in TSO Background Jobs
• Executing REXX Execs in Batch Jobs

Supplemental Topics (as time permits)

• REXX Language Support in DB2
• REXX Support for MVS Operator Commands
• Compiling REXX Execs

To Hire a proven z/OS REXX Subject Matter Expert Consultant and Instructor that teaches this class, call 800-798-3901 today!