Groovy syntax in pipelines in Jenkins - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the basic structure of a Jenkins pipeline script using Groovy?

A Jenkins pipeline script typically starts with the pipeline block, containing agent to specify where to run, and stages with multiple stage blocks defining steps.

beginner

How do you define a variable in Groovy within a Jenkins pipeline?

You define a variable using def keyword, for example: def myVar = 'Hello'. Variables can be used to store values during the pipeline execution.

intermediate

What is the purpose of the script block in a declarative Jenkins pipeline?

The script block allows you to write imperative Groovy code inside a declarative pipeline, enabling complex logic that is not supported directly by declarative syntax.

beginner

How do you write a simple conditional statement in Groovy within a Jenkins pipeline?

Use the standard Groovy if statement, for example:<br>if (env.BRANCH_NAME == 'main') { echo 'On main branch' }.

beginner

What is the difference between sh and bat steps in Jenkins pipelines?

sh runs shell commands on Unix/Linux agents, while bat runs batch commands on Windows agents. Both are used to execute system commands from Groovy scripts.

Which keyword is used to define a variable in Groovy within a Jenkins pipeline?

A def

B var

C let

D const

In Groovy, variables are defined using the def keyword.

What does the agent block specify in a Jenkins pipeline?

A The pipeline stages

B The machine or environment where the pipeline runs

C The steps to execute

D The pipeline triggers

The agent block tells Jenkins where to run the pipeline or stage.

How do you write a conditional statement in Groovy to check if the branch is 'main'?

A if (BRANCH_NAME === 'main') { ... }

B if BRANCH_NAME = 'main' then ...

C if (env.BRANCH_NAME == 'main') { ... }

D if [ $BRANCH_NAME == 'main' ]

Groovy uses if (condition) { } syntax and environment variables are accessed via env.

What is the purpose of the script block in a declarative pipeline?

A To write imperative Groovy code inside declarative syntax

B To define environment variables

C To specify the agent

D To declare pipeline stages

The script block allows complex Groovy code that declarative syntax does not support.

Which step should you use to run a shell command on a Linux agent in Jenkins pipeline?

A powershell

B bat

C cmd

D sh

sh runs shell commands on Unix/Linux agents.

Explain how to structure a simple Jenkins pipeline using Groovy syntax.

Think about the main blocks that organize the pipeline.

Describe how to use variables and conditional statements in Jenkins pipeline Groovy scripts.

Focus on variable declaration and simple if conditions.