Job Control Language (JCL) is a scripting language used on the IBM mainframe operating systems z/OS and z/VSE (and predecessors) to instruct the system on how to run a batch job or start a subsystem. In z/VSE, it is sometimes referred to as JCS (Job Control Statements). In z/OS, Job Entry Control Language (JECL) controls how JES2 or JES3 handles the job execution and output.
