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That job setup uses a language called JCL. And while COBOL reads more or less like english statements, to the point that anyone who has ever programmed procedurally could follow it, JCL is quite inscrutable. One old joke was that nobody ever writes JCL from scratch, they just take what worked last time and change the dataset names.

http://www.jargon.net/jargon/jargonfile/j/JCL.html




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