[ 常見問題 ] Jenkins Global environment variables in Jenkinsfile

Source From Here
Question
How do I invoke Global environment variables in Jenkinsfile? For example, if I have a variable:

name:credentialsId
value:xxxx-xxxx-xxxxx-xxxxxxxxx

How do I use it in the groovy script?

How-To
In a Jenkinsfile, you have the "Working with the Environment" which mentions:

The full list of environment variables accessible from within Jenkins Pipeline is documented at localhost:8080/pipeline-syntax/globals#env,

The syntax is ${env.xxx} as in:

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1. node {  
2.     echo "Running ${env.BUILD_ID} on ${env.JENKINS_URL}"  
3. }  

See also "Managing the Environment".

How can I pass the Global variables to the Jenkinsfile?
When I say Global variables - I mean in

Check path as below:

Jenkins -> Manage Jenkins -> Configure System -> Global properties -> Environment variables

See "Setting environment variables"

Setting an environment variable within a Jenkins Pipeline can be done with the withEnv step, which allows overriding specified environment variables for a given block of Pipeline Script, for example:

Jenkinsfile (Pipeline Script)

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1. node {  
2.     /* .. snip .. */  
3.     withEnv(["NAME=value"]) {  
4.         ... your job  
5.     }  
6. }