Jenkinsfile

def label = input(message: 'Pick a node:', parameters: [string(defaultValue: 'docker', description: '', name: 'Node')])

node(label) {
    def lastCommand = 'ls'
    while (true) {
        lastCommand = input(message: 'Execute on the host:', ok: 'Run', parameters: [string(defaultValue: lastCommand, description: '', name: 'Command')])
        sh(returnStatus: true, script: lastCommand)
    }
}