JCL Overview
What is JCL?
Job Control Language (JCL) is a means of communicating with the IBM 3090 MVS Operating System. JCL statements provide information that the operating system needs to execute a job.
A job is something that you want to accomplish with the aid of a mainframe computer, e.g. copy a data set, execute a program, or process multiple job steps. You need to supply the information that the job requires and instruct the computer what to do with this information. You do this with JCL statements. A job step consists of statements that control the execution of a program or procedure, request resources, and define input and/or output.
This includes information about:
- the program or procedure to be executed
- input data
- output data
- output reports
A JCL statement also provides information about who the job belongs to and which account to charge for the job.
An auxiliary program used with JCL is Job Entry Subsystem 2 (JES2). JES2 statements supply information to increase the efficiency of reading, scheduling, and printing jobs. (Information about JES2 is available in this module in the section titled Job Entry Subsystem Control Statements.)
What Can I Do With JCL?
- submit a job to the operating system
- request resources needed to run the job
- control the system’s processing of the job
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