EECS 1012 Lecture Notes - Lecture 31: Job Control Language, Batch Processing
13 Jun 2018
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EECS 1012 Lecture 31 Notes
Introduction
Batch System Commands
• In addition to wild card provisions, some operating systems allow the user to back up
and repeat a previous command using the cursor keys on the keyboard.
• Such systems usually allow the user to edit the command, as well.
• Command line interfaces are well suited to experienced users who are comfortable with
the system and who want the power and flexibility that a CLI offers them.
• Command line interfaces are generally the hardest to learn.
• The range of possibilities and options that accompany many commands often make it
difficult to figure out the particular syntax that is required for a desired operation.
• Manuals and online help are particularly useful in working with command line
interfaces.
• Olie help is availale for all Liu oads usig the a oad ae
command.
• Batch systems use an interface that is similar to the command line interpreter in many
respects, but the purpose is different.
• Commands specify the location of programs to be executed and data to be used, using a
Job Control Language.
• Job control commands use a format similar to that of the command line interpreter:
command operand1 operand2
• Batch command operands also are either of keyword or positional type.
• The most familiar language of this type is IBM zOS/Job Control Language.
• Bath jos osistig of oe or ore progras are suitted to a sste for
execution and are generally executed with no human interaction.
• Since direct human interaction with the batch system is not possible, all steps must be
carefully planned out, including actions to be taken when errors occur.
• Systems usually allow the user to edit the command, as well.
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