PowerShell can set environment variables only in its process set, so these changes will not persist and are not visible outside of PowerShell.
To permanently set environment variables, here is a simple function:
[Environment]::SetEnvironmentVariable($Name, $Value, $Target)
This is how you can set environment variables now:
PS> Set-EnvironmentVariable -Name test -Value 123 -Target User
You can also remove environment variables by submitting an empty string as value:
PS> Set-EnvironmentVariable -Name test -Value "" -Target User
This is why the -Value parameter was declared with the [AllowEmptyString()] attribute; without this attribute, a mandatory parameter cannot receive an empty string, thus without this attribute, the function would not have been able to remove environment variables.
Another noteworthy part is the type declaration for the -Target parameter: because an enumeration type was specified, when you use this function in the PowerShell ISE or another editor with IntelliSense, the editor will conveniently provide IntelliSense choices.
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