z/OS MVS JCL Reference
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Job Control Tasks

z/OS MVS JCL Reference
SA23-1385-00

For your program to execute on the computer and perform the work you designed it to do, your program must be processed by your operating system.

Your operating system consists of an MVS base control program (BCP) with a job entry subsystem (JES2 or JES3) and DFSMSdfp installed with it.

For the operating system to process a program, programmers must perform certain job control tasks. These tasks are performed through the job control statements, which consist of:
  • JCL statements
  • JES2 control statements
  • JES3 control statements

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