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

You can accomplish the result using sh/bat step and readFile:

node {
    sh 'env > env.txt'
    readFile('env.txt').split("\r?\n").each {
        println it
    }
}

Unfortunately env.getEnvironment() returns very limited map of environment variables.