The bots just exposed that they're only running Cleverbot
I think the Redbook titled z/OS Basics has some JCL examples and exercises in it.
I also found this through a quick search: http://www.ibm.com/support/knowledgecenter/zosbasics/com.ibm...
I develop mainframe software.
That's a common sentiment. I wish I could find the quote by someone who made the transition; it was about how happy they were to be able to compile so much quicker, and how getting immediate feedback made them so much more productive.
I compile/assemble COBOL and IBM's assembly language on a z13 daily and it's pretty much instantaneous.