How do you set var=/? in cmd.exe?



As an IT administrator, one of the most common tasks you may need to perform is to set the value of a variable in the Windows Command Prompt (CMD.exe). This article will explain how to do this, and why it may be necessary to do so.

In the Windows command line, a variable is a named memory location that stores a value or data that can be used in a script or program. Variables are used to store information that may be required by a program or script at a later time. For example, a variable may be used to store the name of a user or the path to a file.

The Windows command line provides multiple commands for setting the value of a variable. The SET command is used to set the value of an environment variable, while the SETLOCAL command is used to set the value of a local variable.

The SET command can be used to create an environment variable. To do this, you need to specify the name of the variable followed by an equal sign and the value that you want to assign to it. For example, the following command will create an environment variable called “USERNAME” and assign it the value “John”:

SET USERNAME=John

The SETLOCAL command can be used to create a local variable. To do this, you need to specify the name of the variable followed by an equal sign and the value that you want to assign to it. For example, the following command will create a local variable called “TEMP” and assign it the value “C:\\Temp”:

SETLOCAL TEMP=C:\\Temp

Once you have created a variable, you can use it in your script or program. For example, if you have created a variable called “USERNAME”, you can use it in your script by typing “%USERNAME%”. This will return the value of the “USERNAME” variable.

In addition to creating and using variables, you may also need to delete them. To delete a variable, you can use the DEL command. For example, the following command will delete the “USERNAME” variable:

DEL USERNAME

It is important to note that deleting a variable will not delete the data stored in the variable. If you need to delete the data stored in a variable, you can use the SET command to set the value of the variable to an empty string. For example, the following command will set the value of the “USERNAME” variable to an empty string:

SET USERNAME=

In summary, setting variables in the Windows command line can be a useful tool for IT administrators. The SET command is used to set the value of an environment variable, while the SETLOCAL command is used to set the value of a local variable. You can also use the DEL command to delete a variable, or the SET command to set the value of a variable to an empty string.

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