3 Days

Mainframe Training Course outline

Overview

• Terminology
• Data structures

Running REXX programs under TSO/E

• Establishing libraries
• Invoking REXX procedures
• Terminating REXX procedures

Writing the first REXX procedure

• External Data Queue (EDQ) - Data stack
• PARSE/PULL keywords
• QUEUED() built-in function
• TRACE diagnostics

Expressions and Operators

• The REXX expression
• Operators
  • Arithmetic
  • Comparison
  • Logical

Assignments and Variables

• Dealing with variables
• PARSING
• Stem Variables

Conditional and Loop Logic

• IF THEN ELSE
• DO Loops

Subroutines and Functions

• Internal vs external routines
• PROCEDURE/EXPOSE clause
• Recursion

Built-in Functions

• REXX built-in functions

Additional Keyword clauses

• PARSE clauses
• DROP/NOP

TSO/E Built-in Functions

• OUTTRAP()
• LISTDSI()
• SYSVAR()
• MVSVAR()

FILE I/O

• Using EXECIO

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