EECS 1012 Lecture 19: EECS 1012 Lecture 19 Notes
13 Jun 2018
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EECS 1012 Lecture 19 Notes
Introduction
Submittal commands
• Your submittal also contained commands to the computer telling it what to do with all
these cards.
• Soe of the oads ere atuall ore iforatioal, like load the folloig
group of cards, hih are data for the progra that ou are ruig.
• The entire submission was known as a job.
• Later on, the COBOL compiler and math routines became part of the software that was
permanently stored on disk within the computer system,
• The system still needed to be told what to do, what programs (e.g., the COBOL
compiler) to call from the disk, where to find the data, and where to print the results.
• As noted, the commands to the computer took the form of punched cards that
contained the required information.
• These cards were called job control cards because they told the computer system how
to control the job.
• The different types of commands made up a sort of language, called job control
language or, more commonly, JCL.
• In other words, a job consisted of a series of commands in JCL intermixed with the
appropriate programs and data.
• The best known of these languages is IBM zOS/JCL, but you should be aware that other
vendors have their own JCL languages.
• Generally, there is no compatibility between JCL languages from different vendors, and
i fat, there are seeral differet iopatile ersios of IBM JCL.
• B the a, ou ight ote that the epressio JCL laguage, hih is i oo
use, is redundant.
• The use of JCL continues to this day.
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