Trying to set value using powershell, in declarative pipeline

[itchymuzzle]

#! /usr/bin/env groovy
pipeline {
    agent any
    stages {
        stage('Build') {
            steps {
                script {
                    powershell '$env:Path'
                    powershell '$env:PYTHONPATH'
                    powershell '$env:PYTHONPATH = "../../dir" '
                    powershell '$env:PYTHONPATH'

 

The value for Path is printed, but nothing else.


The snippit generator gives me that syntax.  


The other confusing thing is that I get the same result with and without 
the PowerScript plugin.  So don’t understand what the plugin is supposed to 
be giving me.


Thanks

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