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JCL (Job Control Language)

JCL is functionaly similar to a shell script.

  • A program that defines a series of programs to run. These programs are referred to as jobs and they are managed by JES (Job Entry Subsystem).

JCL Job Header

  • This is the metadata that is specified at the top of a JCL job. Note the JCL Job Header can be important for auditing purposes.


  • In SMP/E, this is JCL used to get a product installed as runnable on the system. In other words, the JCLIN finishes the install of a product on the system.

JES (Job Entry Subsystem)

  • Component of z/OS that manages jobs or work that is submitted for the system to process.


  • Shows everything that happend when JES ran a JCL job.