node('host.domain.com') {
    env.ARTIFACTORY_SERVER = 'https://host.domain.com/artifactory'
    env.ABC_VAR = 'abc'
    env.PYPI_REPO = 'something'

    try {
        // clean first so we have the RPMs at the end to look at / test with
        stage('Cleanup') {
            cleanWs()
        }
    	stage('test vars') {
            echo env.PYPI_REPO
            echo params.pypi_repo1
            sh 'echo PYPI_REPO without curly braces is $PYPI_REPO'
	        sh 'echo PYPI_REPO with curly braces is ${PYPI_REPO}'
	        sh "echo PYPI_REPO with double quotes is $PYPI_REPO"
	        sh 'echo ABC_VAR without curly braces is $ABC_VAR'
            sh 'echo sleeping 5 && sleep 5s'
    	}
    }
    catch (err) {
        currentBuild.result = "FAILURE"
        throw err
    }
}

[Pipeline] { (test vars) (hide)
[Pipeline] echo
something
[Pipeline] echo
uda-pypi-dev
[Pipeline] sh
+ echo PYPI_REPO without curly braces is something
PYPI_REPO without curly braces is something
[Pipeline] sh
+ echo PYPI_REPO with curly braces is something
PYPI_REPO with curly braces is something
[Pipeline] sh
+ echo PYPI_REPO with double quotes is something
PYPI_REPO with double quotes is something
[Pipeline] sh
+ echo ABC_VAR without curly braces is abc
ABC_VAR without curly braces is abc
[Pipeline] sh
+ echo sleeping 5
sleeping 5
+ sleep 5s

[Pipeline] { (test vars)
[Pipeline] echo
something
[Pipeline] echo
uda-pypi-dev
[Pipeline] sh
+ echo PYPI_REPO without curly braces is
PYPI_REPO without curly braces is
[Pipeline] sh
+ echo PYPI_REPO with curly braces is
PYPI_REPO with curly braces is
[Pipeline] sh
+ echo PYPI_REPO with double quotes is something
PYPI_REPO with double quotes is something
[Pipeline] sh
+ echo ABC_VAR without curly braces is abc
ABC_VAR without curly braces is abc
[Pipeline] sh
+ echo sleeping 5
sleeping 5
+ sleep 5s