Declaring a variable in batch files

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. There is also a variable syntax using! This is a special type of situation called delayed expansion.

You can read the command line arguments passed to your script using a special syntax. NOT Operator. SET command is used to set the variable values.

After equals operator can assign the values without sourrounding by any quotes. How to declare variable. Next Topics. If Else. IF statement.

For Loop. Previous Topics. Directory is Exist. Inline multiple statements. Prompt value. Not equals. Recent Updates. How to manage users in Mysql?

Cursor in Mysql of Code Template by. Top authors Hot Updates. J2EE Technologies Tutorial. Lightsail ssh not working after Ubuntu Upgrade How to Copy letsencrypt ssl certificate to another server in 3 Steps?

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.

Improve this answer. Brian Nixon Brian Nixon 8, 1 1 gold badge 16 16 silver badges 24 24 bronze badges. Is that a typo? So this is what MS came with — Falaque. Are there any downsides for the last syntax?