Let's Build a Jenkins Pipeline

JenkinsFile1

pipeline {
  agent any
  stages {
    stage('Build') {
      steps {
        echo 'Hello from Build'
      }
    }
    stage('Test') {
      steps {
          echo 'Testing Testing 123'
      }
    }
    stage('Deploy') {
      steps {
        echo 'Deploy some things'
      }
    }
  }
}

JenkinsFile2

pipeline {
  agent {
    label 'docker'
  }
  stages {
    stage('Build') {
      steps {
        echo 'Hello from Build'
      }
    }
    stage('Test') {
      steps {
          echo 'Testing Testing 123'
      }
    }
    stage('Deploy') {
      steps {
        echo 'Deploy some things'
      }
    }
  }
}

Jenkinsfile3

pipeline {
  agent {
    label 'docker'
  }
  stages {
    stage('Build') {
      steps {
        echo 'Hello from Build'
        writeFile(file: 'config', text: 'version=1', encoding: 'UTF-8')
        stash(name: 'pom-config', includes: 'config')
      }
    }
    stage('Test') {
      environment {
            configValue = readFile(encoding: 'UTF-8', file: 'config')
      }
      steps {
        echo 'Testing Testing 123'
        unstash 'pom-config'
        sh 'echo "$configValue"'
      }
    }
    stage('Deploy') {
      steps {
        echo 'Deploy some things'
      }
    }
  }
}

Jenkinsfile4

pipeline {
  agent {
    label 'docker'
  }
  stages {
    stage('Build') {
      steps {
        echo 'Hello from Build'
        writeFile(file: 'config', text: 'version=1', encoding: 'UTF-8')
        stash(name: 'pom-config', includes: 'config')
      }
    }
    stage('Test') {
      environment {
            configValue = readFile(encoding: 'UTF-8', file: 'config')
      }
      steps {
        echo 'Testing Testing 123'
        unstash 'pom-config'
        sh 'echo "$configValue"'
      }
    }
    stage('Deploy') {
      steps {
        echo 'Deploy some things'
        input 'Do you want to deploy?'
	      echo 'deployed'
      }
    }
  }
}