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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.
As a unit of execution, a job may be concretely identified with a single process, which may in turn have subprocesses (child processes; the process corresponding to the job being the parent process) which perform the tasks or steps that comprise the work of the job; or with a process group; or with an abstract reference to a process or process ...
A job description or JD is a written narrative that describes the general tasks, or other related duties, and responsibilities of a position. It may specify the functionary to whom the position reports, specifications such as the qualifications or skills needed by the person in the job, information about the equipment, tools and work aids used, working conditions, physical demands, and a ...
Probably the most well-known is IBM's Job Control Language (JCL). Job schedulers select jobs to run according to a variety of criteria, including priority, memory size, etc. Remote batch is a procedure for submitting batch jobs from remote terminals, often equipped with a punch card reader and a line printer. [4]
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.
Most of their duties are taught on the job, [citation needed] as their job description will vary according to the systems they help to manage. Responsibilities of a computer operator may include: Monitor and control electronic computer and peripheral electronic data processing equipment to process business, scientific, engineering, and other ...
[1] [2] The Family Support Act put the program under titles IV-A and IV-F of the Social Security Act, and the regulations were codified at 45 CFR 250. JOBS was replaced by the Temporary Assistance for Needy Families (TANF) program in 1997 pursuant to the Personal Responsibility and Work Opportunity Reconciliation Act (PRWORA) of 1996.
In many contexts, a callable may have side effect behavior such as modifying passed or global data, reading from or writing to a peripheral device, accessing a file, halting the program or the machine, or temporarily pausing program execution. Side effects are considered undesireble by Robert C. Martin, who is known for promoting design principles.