Simple pipeline (declarative)

gistfile1.txt

def GLOBALVAR="GLOBAL"

pipeline {
    parameters {
        choice(name:'CHOICE1', choices:["ALL", "NOTHING"], description: 'choices test')
        string(name:"STRING1", defaultValue:"string default")
    }
    
	agent { node { label 'mac' } }
	
	stages {
		
		stage("test1") {
		    environment {
                FOO = "bar"
            }
		    steps {
		        script {
		            def VAR1="var1"
		            GLOBALVAR="inscript"
		            echo "3 $VAR1"
		        
    		        sh ("""#!/bin/bash -xe
		            echo "1 $GLOBALVAR"
		            echo "2 $FOO"
    		        echo "3 ${params.CHOICE1}"
	    	        echo "4 $PARAM1"
	    	        echo "5 $VAR1 seen only in script block"
		            env
		            set
		            export
		        """)
		        }
		        echo "${GLOBALVAR}"
		    }
		    post {
		        success {
		            echo "SUCCESS"
		            echo " global in post: ${GLOBALVAR}"
		        }
		    }
		}
		stage ("test2") {
		    steps {
		        echo " ===== $GLOBALVAR"
		        script {
		            GLOBALVAR="step2"
		            dir ("./artifact") {
		                sh ("echo TEST >> text1.txt")
		            }
		        }
		        echo "$GLOBALVAR"
		        stash(name:"test", includes:"artifact/*")
		        script{sh("ls -la artifact")}
		    }
		}
		stage ("Linux step") {
		    agent { node { label 'linux' } }
		    steps {
		        echo "Runned on linux"
		        unstash("test")
		        script {
		            sh("""pwd
		            ls -la
		            ls -la artifact""")
		        }
		    }
		}
	}
}