Best of Jenkinsfile, a collection of useful workflow scripts ready to be copied into your Jenkinsfile on a per use basis.

Jenkinsfile

#!groovy
# Best of Jenkinsfile
# `Jenkinsfile` is a groovy script DSL for defining CI/CD workflows for Jenkins
node {
}

mvn-build-and-test.groovy

# Jenkinsfile
# Build and test a Maven project

node {
  git url: 'https://github.com/user/repo.git'
  def mvnHome = tool 'M3'
  sh "${mvnHome}/bin/mvn -B -Dmaven.test.failure.ignore verify"
  step([$class: 'JUnitResultArchiver', testResults:
'**/target/foobar/TEST-*.xml'])
}

mvn-verify.groovy

# Jenkinsfile
# Verify a Maven project

node {
  git url: 'https://github.com/user/repo.git'
  def mvnHome = tool 'M3'
  sh "${mvnHome}/bin/mvn -B verify"
}

parallel-stage-2.groovy

stage "unit test"

node {
   git "[email protected]:michaelneale/oaks-trail-ride.git"
   sh "echo unit test app"
}

stage "test on supported OSes"

parallel (
  windows: { node {
    sh "echo building on windows now"

 }},
  mac: { node {
    sh "echo building on mac now"
 }}

parallel-stage.groovy

node {
  for (int i=0; i< 2; ++i) {  
    stage "Stage #"+i
    print 'Hello, world $i!'
  }

  stage "Stage Parallel"
  def branches = [:]
  for (int i = 0; i < numHelloMessages.toInteger(); i++) {
    branches["split${i}"] = {
      stage "Stage parallel- #"+i
      node('remote') {
       echo  'Starting sleep'
       sleep 10
       echo  'Finished sleep'
      }
    }
  }
  parallel branches
}

The preferred method of getting job parameters is to use the "params" map.

So use echo params.paramA

See https://jenkins.io/doc/book/pipeline/syntax/#parameters

Can someone please give an example of jenkins file which shows how to connect to jenkins slave and execute the shell scripts and python scripts residing in jenkins slave itself.