On Thu, 13 Jan 2011 08:06:05 -0600, Mark Hammack wrote:
>I always wanted a more powerful "IF/THEN/ELSE" statement in JCL. Something
>that would let me test things like the value of a substitution value (i.e.
>from a SET statement). Wound up getting around that with INCLUDE and
>include members using names derived from the SET statement. Kludgy, but
>works OK for me.
>
I wish first that IBM would clean up the documentation of the
existing "IF/THEN/ELSE" statement:
Title: z/OS V1R12.0 MVS JCL Reference
Document Number: SA22-7597-14
Build Date: 07/01/10
...
17.1.4.5 Relational-Expression Keywords
The following keywords are the only keywords supported by IBM
and recommended for use in relational-expressions. Any other
keywords, even if accepted by the system, are not intended or
supported keywords. ...
Rather, a programmer's use of constructs which are "not intended
or supported" should result in JCL errors. Other constructs,
presumably intended and supported should be documented as such.
It's irresponsibie; it appears that even the authors and implementors
couldn't agree on or understand the semantics of the feature.
-- gil
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