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IBM's job control language -- the shell of the mainframe. Designed for easy processing from punch cards of the OS360 system. Significant source of LegacyProblems?.

The reference guide [1] and the user's guide [2] are on line available.

Quote of the year on page 25 of the user's guide, Chez MVS

--ArieVanDeursen && TobiasKuipers