Appendix
AI
Job
Control
Language
The TRSDOS Job Control Language (JCL)
is
one of the most
powerful features of TRSDOS.
It
consists of:
• TRSDOS commands
• Macros
• Special symbols
You
can use JCL
to
make your computer more "user friendly." That
is,
you can write JCL programs that perform a variety of functions,
such as FORMAT and BACKUP, and have TRSDOS execute these
functions when the user types
in
one command line.
If
you have read the entries
on
the BUILD and
DO
commands, you
know how to create a JCL file composed of TRSDOS commands.
You can make this file more powerful by utilizing macros and other
features of JCL. This section describes how.
The steps for creating
and
using a JCL file are:
1.
Create a JCL file consisting of TRSDOS commands, macros, or
special symbols.
You
can do this with the BUILD command,
SCRIPSIT, or a BASIC program.
2.
Execute the JCL file with the DO command. This causes the JCL
processor to:
• Take control of the keyboard (for line input)
• Read a line
in
the
DO
file exactly
as
if
it
came from the
keyboard
• Return control of the keyboard
to
the user when it reaches the
last line.
The following sections give complete information
on
all the JCL
features:
• Simple JCL Execution
• Simple JCL Compiling
• Advanced JCL Compiling
A-3
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