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

According to Jenkins documentation for declarative pipeline:

sh 'printenv'

For Jenkins scripted pipeline:

echo sh(script: 'env|sort', returnStdout: true)

The above also sorts your env vars for convenience.

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

The following works:

@NonCPS
def printParams() {
  env.getEnvironment().each { name, value -> println "Name: $name -> Value $value" }
}
printParams()

Note that it will most probably fail on first execution and require you approve various groovy methods to run in jenkins sandbox. This is done in "manage jenkins/in-process script approval"

The list I got included:

• BUILD_DISPLAY_NAME
• BUILD_ID
• BUILD_NUMBER
• BUILD_TAG
• BUILD_URL
• CLASSPATH
• HUDSON_HOME
• HUDSON_SERVER_COOKIE
• HUDSON_URL
• JENKINS_HOME
• JENKINS_SERVER_COOKIE
• JENKINS_URL
• JOB_BASE_NAME
• JOB_NAME
• JOB_URL

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.

Why all this complicatedness?

sh 'env'

does what you need (under *nix)