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Defining and using a variable in batch file Ask Question. Asked 9 years, 8 months ago. Active 7 months ago. Viewed k times. I'm trying to define and use a variable in a batch file. Why is my variable not being echo'd?
Improve this question. Magoo Jamie Dixon Jamie Dixon Add a comment. Active Oldest Votes. In the above code snippet, a variable called message is defined and set with the value of "Hello World".
In batch script, it is also possible to define a variable to hold a numeric value. All of the arithmetic operators work in batch files. The following example shows arithmetic operators can be used in batch files. In any programming language, there is an option to mark variables as having some sort of scope, i. This is a useful tool if you need to validated that user input is a numerical value. System-wide variables, known as environmental variables, use uppercase names.
It would be a bad idea to overwrite these dynamic variables. The example below prints the current value of the variable foo to the console output. The SET command with no arguments will list all variables for the current command prompt session. By default, variables are global to your entire command prompt session. This example demonstrates changing an existing variable named foo within a script named HelloWorld.
There are a few special situations where variables work a bit differently.
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