Accessing parameters in Jenkins

Question

How do I access this variable in a shell script.

I have tried

1. echo params.$STATES;
2. echo $STATES;

Output for the first one is params. . Output for the second one is an empty string. The output I am expecting is the string I am passing when I build that job with parameters.

Answer 1

1. If you are using the 'Execute Shell' block in a Freestyle Project, you will need a $ (dollar sign) before the variable. Since you already tried this, there could be an issue not wrapping variable within {}

• try echo ${STATES}
• More info on curly braces around variables, See: codeforester answer on usage of curly braces around shell variables

2. If you are using a Jenkinsfile without a shell block (valid in Scripted and Declarative)

• Use dollar sign with double quotes

node(){
    echo "$STATES"
}

pipeline {
    agent any
    stages {
        stage('Hello') {
            steps {
                echo "$STATES"
            }
        }
    }
}

• or without Double quotes and dollar sign

node(){
    echo STATES
}

pipeline {
    agent any
    stages {
        stage('Hello') {
            steps {
                echo STATES
            }
        }
    }
}

3. If you are using a Shell block in the Jenkinsfile pipeline, use sh "echo $STATES" or sh "echo ${STATES}" (as in the Freestyle Execute Shell block, Double quotes are needed for interpolation)

See

• String interpolation in Jenkinsfiles
• Handling parameters in Jenkinsfiles