Jenkinsfile.groovy

node {
  // # # + echo foo is: 
  // foo is:
  withEnv(['FOO=bar']) {
    sh 'echo "foo is: $FOO"'
  }
  
  // # # + echo hello is: 
  // hello is:
  env.HELLO = 'world'
  sh 'echo "hello is: $HELLO"'
}