Create the following JobDSL job.

freeStyleJob("tryDSL") { 
description("This a new job") 
steps { 
shell('echo "Hello World "') 
} 
}

If there is a job which already has this name `tryDSL` on the instance, it will overwrite itself with the awaited content brought by the DSL script.

freeStyleJob should support an update boolean argument to specify if you want or not override