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IBM's High-Level Assembler and JCL mostly.

I develop mainframe software.

I recently had to put together a small program with JCL for work, and had real difficulty in finding documentation. Can you recommend anything?

Most of what I've learned has been from examples from co-workers, but I've also used the IBM knowledge center and the IBM "Redbooks".

I think the Redbook titled z/OS Basics has some JCL examples and exercises in it.