How to get specific information about the current build project in Jenkins with Groovy?

Question

In Jenkins/Hudson, with the help of a Postbuild Groovy script, I would like to get one of the following:

• an environment variable (e.g. current JOB_NAME, BUILD_NUMB

Answer 1

Using Jenkins v2.17 this works for me:

echo "BUILD_NUMBER=${env.BUILD_NUMBER}"