MPE/iX commands tell the computer to perform a specific function.
The parameters you enter for each command tell the computer to perform
the function in a specific way. MPE/iX uses four classifications
of parameters:
These four classifications of parameters are briefly defined
below. To understand the command syntax diagrams, refer to the Conventions
pages in the front of this manual.
Required Parameters |
 |
If a command has any required parameters, they must be entered
or MPE/iX displays an error message. In the syntax diagrams for
each command in this chapter, required parameters are either surrounded
by no other marks or by braces { }. In the following example, since myfile is not surrounded by any marks, it is a required
parameter:
In some cases, you must select one parameter from a list of
two or more parameters. In the following example, you must provide
either a job number or a session number since these parameters are
surrounded by braces:
Optional Parameters |
|
If a command has any optional parameters, you can either specify
or ignore them, depending upon how you want the command to execute.
In the syntax diagrams for each command in this chapter, optional
parameters are surrounded by brackets [ ]. If you ignore optional parameters, MPE/iX uses
the system-defined default values for each parameter. In the following
example, [;PASS] is an optional parameter since it is surrounded
by brackets:
NEWGROUP groupname [;PASS=[password]] |
Positional Parameters |
|
The meaning of a positional parameter depends upon its position
(location) in the parameter list. In the syntax diagrams for each
command in this chapter, positional parameters are separated from
each other by a comma (,). If you omit a positional parameter from the
list, you must provide the comma placeholder that would normally precede
that parameter. In the following example, the subparameters of the REC parameter of the BUILD command can be treated as positional parameters:
BUILD filename;REC=128,1,F,ASCII |
If you choose to use the system-defined default value F, you need not specify it, but you must hold the
position with a comma:
BUILD filename;REC=128,1,,ASCII |
Keyword Parameters |
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A keyword parameter denotes the meaning or value of a given
parameter. In the syntax diagrams for each command in this chapter,
keyword parameters appear in uppercase (CAPITAL) letters (although you may enter them in either
uppercase or lowercase) and are preceded by a semicolon (;). In the following example, REC is a keyword parameter:
BUILD filename;REC=128,1,F,ASCII |
Refer to the section "Combining Positional/Keyword Parameters,"
below, for additional information.
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