EECS 1012 Lecture Notes - Lecture 20: Job Control Language, Batch Processing, Operand
13 Jun 2018
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EECS 1012 Lecture 20 Notes
Introduction
Card images are batched together
• The card images are usually batched together as a file of commands that is executed in
the sae wa that a progra is, ecept that each lie of the progra is actuall a
command to the operating system.
• Operands in each JCL command specify the appropriate files and other details that are
required.
• Both positional and keyword operands are used.
• The commands that you use on your computer are not very different from the ones that
make up a job control language.
• After all, a computer is a computer, and the tasks that you do are not really very
different from those that are done as part of a batch job.
• Although you commonly perform command operations one at a time
• You can probably think of times when it would have been convenient to combine a
group of commands that you could have done all at once.
• In fact, you may already be aware that there is a way to do this.
• As we previously have noted, operating systems provide a way to group commands into
a single file that can be executed as if it were a program.
• The file may itself even contain executable programs.
• In addition to the usual commands, the operating system provides additional commands
that are used specifically for this purpose, commands that allow branching and looping,
for example.
• An example of a Windows command language script that prepares backup for a text file
by copying an old version to a flash drive (E:)
• Creating a new backup on hard disk
• Then opening the word processor program
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