In Jenkins declarative pipeline, you can define variables using the environment block or using the def keyword. The environment block is used to define environment variables that will be available to all steps in the pipeline, while the def keyword is used to define variables within individual stages or steps.
Here's how you can define variables using both methods:
1. Using the environment block:
pipeline {
agent any
environment {
// Define environment variables here
VARIABLE_1 = "Hello, world!"
VARIABLE_2 = "Some value"
}
stages {
stage('Example Stage') {
steps {
echo "Value of VARIABLE_1: ${env.VARIABLE_1}"
echo "Value of VARIABLE_2: ${env.VARIABLE_2}"
}
}
}
}In this example, we define two environment variables, VARIABLE_1 and VARIABLE_2, within the environment block. These variables can be accessed using the env object inside the pipeline's steps.
2. Using the def keyword:
pipeline {
agent any
stages {
stage('Hello') {
steps {
// Define variables using the def keyword
def Var1 = "Hello, world!"
def Var2 = "Some value"
echo "Value of Var1: ${Var1}"
echo "Value of Var2: ${Var2}"
}
}
}
}In this example, we define two variables, Var1 and Var2, within the steps block using the def keyword. These variables are only accessible within the scope of that specific stage or steps block.
Both methods allow you to define variables, but the choice between them depends on whether you need the variables to be available globally (using the environment block) or limited to a specific scope (using the def keyword).
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