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Learning objective: (2) Explain the use of replaceable parameters in batch files
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Replaceable parameters allow you to pass data from the command line into the batch file when it is executed. There is a corresponding 1:1 relationship between what is entered on the command line and the replaceable parameter referenced in the batch file. These make batch files significantly more versatile. In the batch file, the replaceable parameter is referenced by a percent sign followed by a number between 1 and 9. Percent zero references the command entered on the command line.
%0 batch file
%0 is the reference to the command being processed. When used with a batch file, it is the name of the batch file.
%1 - %9 replaceable parameters
%1 - %9 represents data being passed from the command line to the batch file. Each parameter is separated by one or more spaces that act as a delimiter. For example, in "DEMO.BAT one two three" %0 is "DEMO.BAT", %1 passes a value of "one", %2 passes a value of "two", and %3 passes a value of "three" to the batch file. These values can be tested by the IF command for further action.
Thinking: Why allow content to be changed at runtime within a batch file?
Key terms: %n, argument, replaceable parameters
Resources:
To maximize your learning, please visit these Web sites and review their content
to help reinforce the concepts presented in this section.
Quick links:
Replaceable Parameters @ bristolcc.edu
DOS Batch File Replaceable Parameters @ algonquincollege.com
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