Delegates will learn how to
- describe the concepts and structure of the REXX language environment
- write and debug REXX programs executing in the TSO environment
- use the tracing and debugging aids effectively
- use the loop control and decision making instructions
- identify and put into practice the most commonly used REXX built in functions
- parse data strings
- use TSO commands and functions within REXX EXECS
- manage I/O using data stacks and stems
- use sub-routines and functions.
Executing REXX EXECs; elements of the REXX language: Clauses, Tokens, Labels, Assignments, Instructions and Commands; constant and variable symbols; Simple, Compound & Stem variable symbols; operators for concatenation, arithmetic, comparison & logical operations.Tracing and Debugging
Using TRACE instruction for debugging; using immediate commands HI, HT, TS and TE; use of EXECUTIL; interpreting TRACE output.Parsing Strings
Parsing variables and strings; basic parsing techniques; special templates; place holders, literal patterns and numeric patterns.Control Instructions
Decisions: IF, THEN, ELSE, SELECT, WHEN, OTHERWISE; creating and controlling loops: DO WHILE, UNTIL, FOREVER, LEAVE, ITERATE; introduction to sub-routines.Sub-routines and Functions
Internal and external sub-routines; how to create internal and external functions; passing arguments and results to and from sub-routines and functions; CALL; RETURN; EXIT; PROCEDURE; RESULT.REXX Built-in Functions
Introduction to REXX supplied built in functions; how to use the most useful ones: ARG, DATE, TIME, DATATYPE, LENGTH, POS, WORDS, LEFT, RIGHT, STRIP, SPACE, COPIES and WORD.Data Stack Management
LIFO and FIFO stacking; avoiding the stack; writing to the stack: PUSH and QUEUE; reading from the stack: PARSE PULL; creating and managing extensions to the stack: MAKEBUF, QBUF and DROPBUF; interrogating the stack: QUEUE, QELEM; creating and managing private stacks: NEWSTACK, DELSTACK and QSTACK.Using TSO Commands & Functions
Using TSO commands and functions: SYSDSN, LISTDSI, MSG, OUTTRAP, PROMPT and SYSVAR; reading and writing datasets with EXECIO.
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