PowerShell - Windows set Environment Var

The following command is to set an environment variable on system or machine level on a windows system via PowerShell:

[System.Environment]::SetEnvironmentVariable('SETUP_ENVIRONMENT','Development',[System.EnvironmentVariableTarget]::Machine)

This sets the variable named SETUP_ENVIRONMENT to the value Development. Change the last part to User if you only want to set the variable on user level.

Check the Variable with:

System.Environment]::GetEnvironmentVariable('SETUP_ENVIRONMENT', [System.EnvironmentVariableTarget]::Machine)

If there is no result then the cache of the terminal will not show it yet. Test closing the terminal and reopen it.