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What is a Host Command Environment? .......................82
How Is a Command Passed to the Host Environment?..................83
Changing the Host Command Environment ......................83
Chapter 9. Diagnosing Problems within a program ...................85
Debugging Programs ...............................85
Tracing Commands with the TRACE Instruction ....................85
Using REXX Special Variables RC and SIGL .....................85
Tracing with the Interactive Debug Facility ......................86
Saving Interactive TRACE Output .........................87
Chapter 10. Programming Style and Techniques ....................89
Consider the Data ................................89
Test Yourself... ................................89
Happy Hour ..................................90
Designing a Program ...............................92
Methods for Designing Loops ...........................93
The Conclusion ................................93
What Do We Have So Far?............................94
Stepwise Refinement: An Example .........................94
Reconsider the Data ..............................95
Correcting Your Program..............................95
Modifying Your Program .............................95
Tracing Your Program ..............................95
Coding Style ..................................96
Part 2. Reference ..............................101
Chapter 11. Introduction .............................103
Who Should Read This Reference..........................103
How to Use This Reference ............................103
Overview of Product Features ...........................104
SAA Level 2 REXX Language Support Under REXX/CICS ................104
Support for the Interpretive Execution of REXX Execs .................104
CICS-Based Text Editor for REXX Execs and Data ..................104
VSAM-Based File System for REXX Execs and Data ..................104
VSE Librarian Sublibraries............................104
Dynamic Support for EXEC CICS Commands ....................105
REXX Interface to CEDA and CEMT Transaction Programs ...............105
High-level Client/Server Support .........................105
Support for Commands Written in REXX ......................105
Command Definition of REXX Commands ......................105
Support for System and User Profile Execs .....................105
Shared Execs in Virtual Storage .........................105
SQL Interface ................................106
How to Read the Syntax Diagrams .........................106
Chapter 12. REXX General Concepts ........................109
Structure and General Syntax ...........................109
Characters .................................110
Comments .................................110
Tokens ...................................111
Implied Semicolons ..............................114
Continuations ................................115
Expressions and Operators ............................115
Expressions .................................115
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