On 7/01/2022 12:23 pm, David Crayford wrote:
I understand that it's declarative. But it has logic such as IF/THEN.
That is no reason why it couldn't have been a scripting language like
CL on AS/400.
IF/THEN was a late addition, and is probably one of the biggest problems
with JCL because it doesn't work like IF/THEN in a programming language.
IF/THEN is really a property of the enclosed steps (I suspect it
generates the same thing as equivalent COND statements on the steps)
rather than a logical block in the JCL.
e.g. from the JCL reference:
The system processes the following statements regardless of the logic of
the IF/THEN/ELSE/ENDIF
statement construct. They can be placed in a THEN or ELSE clause, but
they are not executed
conditionally.
• PROC and PEND statements
• JES2 and JES3 statements and commands
• JCL command statements
• Comment (//*) statements
• INCLUDE statements
• Delimiter (/*) statements
• Null statements
• SET statements
The IF/THEN/ELSE/ENDIF statement construct does not conditionally
control the processing of JCL; rather, it conditionally controls the
execution of job steps.
--
Andrew Rowley
Black Hill Software
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