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2. Job stream - Wikipedia

   en.wikipedia.org/wiki/Job_stream

   The term "job stream" is particularly associated with mainframes; in the IBM z/OS operating system, a job is initiated by a // JOB and terminated by the next // JOB or // statement. Each job step consists of one // EXEC statement indicating the program to be executed and usually multiple // DD statements defining the files and devices to be used.

3. Job Control Language - Wikipedia

   en.wikipedia.org/wiki/Job_Control_Language

   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.

4. Job Entry Subsystem 2/3 - Wikipedia

   en.wikipedia.org/wiki/Job_Entry_Subsystem_2/3

   The Job Entry Subsystem (JES) is a component of IBM's MVS mainframe operating systems that is responsible for managing batch workloads. In modern times, there are two distinct implementations of the Job Entry System called JES2 and JES3. They are designed to provide efficient execution of batch jobs.

5. History of IBM mainframe operating systems - Wikipedia

   en.wikipedia.org/wiki/History_of_IBM_mainframe...

   The first operating systems for IBM computers were written in the mid-1950s by IBM customers with very expensive machines at US$2,000,000 (equivalent to about $23,000,000 in 2023), which had sat idle while operators set up jobs manually, and so they wanted a mechanism for maintaining a queue of jobs. [3]

6. Job scheduler - Wikipedia

   en.wikipedia.org/wiki/Job_scheduler

   A job scheduler is a computer application for controlling unattended background program execution of jobs. [1] This is commonly called batch scheduling , as execution of non-interactive jobs is often called batch processing , though traditional job and batch are distinguished and contrasted; see that page for details.

7. Mainframe computer - Wikipedia

   en.wikipedia.org/wiki/Mainframe_computer

   A mainframe computer, informally called a mainframe or big iron, [1] is a computer used primarily by large organizations for critical applications like bulk data processing for tasks such as censuses, industry and consumer statistics, enterprise resource planning, and large-scale transaction processing.