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How Jenkins knows when to execute a Scheduled job/pipeline and how it is triggered?

@Sumit, If you want to run the job periodically for a specific branch using a multibranch pipeline you can do this in your Jenkinsfile:

def call(String cronBranch = 'master') {

    // Cron job to be run from Monday to Friday at 10.00h (UTC)

    String cronString = BRANCH_NAME == cronBranch ? "0 10 * * 1-5" : ""

    pipeline {

        agent any

        triggers {

            cron(cronString)

        }

        stages {

            stage('My Stage') {

                //Do something

            }

        }

    }

}

or complete Example (taken from docs) Ref: https://jenkins.io/doc/book/pipeline/syntax/#triggers

pipeline {

    agent any

    triggers {

        cron('H */4 * * 1-5')

    }

    stages {

        stage('Example') {

            steps {

                echo 'Hello World'

            }

        }

    }

}