This article is about IBM mainframe job control language. For open systems, see job control (Unix). For general term, see job control.
Job Control Language (JCL) is a scripting language used on IBM mainframe operating systems to instruct the system on how to run a batch job or start a subsystem.[1] The purpose of JCL is to say which programs to run, using which files or devices[2] for input or output, and at times to also indicate under what conditions to skip a step. Parameters in the JCL can also provide accounting information for tracking the resources used by a job as well as which machine the job should run on.
There are two distinct IBM Job Control Languages:
one for the operating system lineage that begins with DOS/360 and whose latest member is z/VSE; and
the other for the lineage from OS/360 to z/OS, the latter now including JES extensions, Job Entry Control Language (JECL).
They share some basic syntax rules and a few basic concepts, but are otherwise very different.[3]
The VM operating system does not have JCL as such; the CP and CMS components each have command languages.
^"Every job submitted for execution ... must include JCL statements" -- ibm.com
^and many more complex details, such as whether the file is to be retained or deleted, the maximum disk space to which it can grow, the name of a tape to be pre-mounted
^Ashley and Fernandez, Job Control Language, p. 1.
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