HOWTO: Change environment variables

In many situations, it’s necessary to set application specific environment variables for testing and debugging purposes. These kind of variables are exclusive to the application and will be dead when the application exits. For example, suppose if you've a rendering application in which the rendering path is specified as environment variable. Sometimes it might be necessary to change these variables for testing or in some situations you may need to add or delete the existing one. In most cases, the application specific variables are controlled launching through script files after setting up necessary variables or by a launcher application (Environment variables are inherited from Parent Process). Still dynamically updating variables is out of our reach.

1. Using a graphical user interface:

   - From the Control Panel, open the System applet.
-Select the Advanced tab.
-Click the Environment Variables button.
-Click the New button under the User variables or System variables box depending on whether you want to create an environment variable that is visible only to the currently logged-on user or system-wide.
-Enter the variable name and value and click OK until all windows are closed.

2. Using a command-line interface:

   - To view environment variables, run the set command. You can also view a subset of environment variables by running set and specifying the first letters of the variable(s). This command displays all environment variables that begin with USER:
> set user
You can use the wmic utility to print environment variables on a remote system:
> wmic /node:"" environment list full
You can print the value of an environment variable using echo:
> echo %systemroot%
To set an environment variable for use in the current CMD session, use the set command. The following command sets the FOOBAR environment variable:
> set FOOBAR=test

Also consider using Action1 to set environment variables if:
- You need to perform this action on multiple (hundreds or even thousands) computers simultaneously.
- Some of your endpoints are laptops not connected to corporate network at all times.

Action1 is a cloud-based platform for software deployment, software/hardware inventory, patch management, endpoint configuration and more. It is free with basic functionality.

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