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Job Control Language
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===Device dependence=== In the original DOS/360 and in most versions of DOS/VS one had to specify the model number of the device which was to be used for each disk or tape file—even for existing files and for temporary files which would be deleted at the end of the job. This meant that, if a customer upgraded to more modern equipment, many JCL files had to be changed. Later members of the DOS/360 family reduced the number of situations in which device model numbers were required.
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