Everyone says learn JCL first. I open a job and it is // this and // that.
Is JCL a programming language? Or just instructions for how to run a program?
Not a programming language. It is the recipe card that tells z/OS: run this program, give it these files, how much space, what to do if it fails.
Your COBOL does the work. JCL sets the stage.
JOB card = who you are / accounting. EXEC = which program or PROC. DD = files and SYSOUT. Learn those three and you can read most jobs.
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