It explains the "why" behind the code, not just the syntax.
which serves as the ultimate "source of truth" beyond the primer. 2. What's Inside the Primer? the mvs jcl primer pdf
BLKSIZE=800 : Block Size is 800 characters (must be a multiple of LRECL for optimal performance). 5. Advanced JCL Concepts Conditional Execution ( COND and IF/THEN/ELSE ) It explains the "why" behind the code, not just the syntax
A robust primer will spend significant time explaining these critical JCL parameters: the mvs jcl primer pdf
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