How to list all `env` properties within jenkins pipeline job?

Question

Given a jenkins 2.1 build pipeline, jenkins injects a env variable into the node{}. For example, BRANCH_NAME can be accessed with

Answer 1

Another, more concise way:

node {
    echo sh(returnStdout: true, script: 'env')
    // ...
}

cf. https://jenkins.io/doc/pipeline/steps/workflow-durable-task-step/#code-sh-code-shell-script