Environment variables access in Jenkins - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is an environment variable in Jenkins?

An environment variable in Jenkins is a key-value pair that stores information accessible to Jenkins jobs during their execution. It helps configure jobs without hardcoding values.

beginner

How do you access an environment variable in a Jenkins Pipeline script?

You access an environment variable in a Jenkins Pipeline using the syntax: env.VARIABLE_NAME. For example, env.BUILD_NUMBER gives the current build number.

intermediate

How can you set a custom environment variable in a Jenkins Pipeline?

You can set a custom environment variable inside the environment block in a Jenkins Pipeline like this:<br>

environment {
  MY_VAR = 'Hello'
}

intermediate

What is the difference between global and job-specific environment variables in Jenkins?

Global environment variables are set for all Jenkins jobs and agents, while job-specific variables are defined only within a particular job or pipeline.

intermediate

How do you print all environment variables in a Jenkins Pipeline?

You can print all environment variables using a shell step:<br>

sh 'printenv'

<br>or in a scripted pipeline:<br>

env.each { k, v -> println "${k} = ${v}" }

How do you access the environment variable named 'PATH' in a Jenkins Pipeline script?

A getEnv('PATH')

B PATH.env

C env.PATH

D environment.PATH

In Jenkins Pipeline, environment variables are accessed using the 'env' object followed by the variable name, like env.PATH.

Where do you define custom environment variables for a Jenkins Pipeline?

A Inside the environment block

B In the Jenkins global config only

C Inside the steps block

D In the Jenkinsfile header comment

Custom environment variables are defined inside the 'environment' block in a Jenkins Pipeline.

Which command prints all environment variables in a Jenkins Pipeline shell step?

A listenv

B printenv

C showenv

D envlist

The 'printenv' command lists all environment variables in a shell environment.

What is the scope of environment variables defined in the Jenkins global configuration?

A Only available during build steps

B Only available to one job

C Only available in post-build actions

D Available to all jobs and agents

Global environment variables are accessible to all Jenkins jobs and agents.

How do you access the current build number in a Jenkins Pipeline?

A env.BUILD_NUMBER

B build.number

C currentBuild.number

D env.BUILDNUM

The current build number is available as the environment variable 'BUILD_NUMBER', accessed via env.BUILD_NUMBER.

Explain how to set and access environment variables in a Jenkins Pipeline.

Think about the environment block and the env object.

Describe the difference between global and job-specific environment variables in Jenkins.

Consider scope and configuration location.