Job control (computing): Difference between revisions

Revision as of 04:50, 8 May 2020

Revision as of 20:45, 30 January 2021

Line 24:

=== Batch-oriented features ===

Although a computer operator may be present, batch processing is intended to mostly operate without human intervention. Therefore, many details must be included in the submitted instructions:

* which program(s)programs to run;

* which file(s)files and/or device(s)devices to useforuse for input-output;<ref>and many more details, such as whether the file is to be retained or deleted, the maximum of disk space to which it can grow, the name of a tape to be pre-mounted</ref> and

* at times to also indicate under what conditions to skip a step.

Line 35:

Non-IBM mainframe [[batch processing|batch]] systems had some form of job control language, whether called that or not; their syntax was completely different from IBM versions, but they usually provided similar capabilities. [[Interactive computing|Interactive]] systems include "[[command language]]s"&mdash;command files (such as PCDOS ".bat" files) can be run non-interactively, but these usually do not provide as robust an environment for running unattended jobs as JCL. On some computer systems the job control language and the interactive command language may be different. For example, [[Time Sharing Option|TSO]] on z/OS systems uses [[CLIST]] or [[Rexx]] as command languages along with JCL for batch work. On other systems these may be the same.

The Non-IBM JCL of what at one time was known as ''the BUNCH'' (Burroughs, Univac/Unisys, NCR, Control Data, Honeywell), except for [[Unisys]], are part of the BANG<ref>what Xerox Data Systems and its SDS purchase called its ''exclamation mark''{{cite web

|url=https://sites.google.com/site/thanhphong37vn/interview-questions-guide/operating-system/operating-systems-list

|title=Operating systems list}}</ref><ref>the SLASH SLASH of its JCL, called ''SLANT SLANT'' by some. T he remainder of this footnote is a reminder, dedicated to the first person from whom I heard SLANT SLANT, the late senior computer operator and retired Military Officer who taught many a people-oriented lesson. Let this be added to his citations.</ref> that has been quieted.