val hello by tasks.registering {
    doLast {
        println("hello world")
    }
}

hello {
    val skipProvider = providers.gradleProperty("skipHello")
    onlyIf("there is no property skipHello") {
        !skipProvider.isPresent()
    }

def hello = tasks.register('hello') {
    doLast {
        println 'hello world'
    }
}

hello.configure {
    def skipProvider = providers.gradleProperty("skipHello")
    onlyIf("there is no property skipHello") {
        !skipProvider.present
    }

...

> Task :hello SKIPPED
Skipping task ':hello' as task onlyIf 'there is no property skipHello' is false.
:hello (Thread[included builds,5,main]) completed. Took 0.018 secs.

executable: gradle
args: hello
flags: -PskipHello

include::sample[dir="snippets/tutorial/taskOnlyIf/groovy",files="build.gradle[]"]

----
$ gradle hello -PskipHello
include::{snippetsPath}/tutorial/taskOnlyIf/tests/taskOnlyIf.out[]
----
====

To find why a task was skipped, run the build with the `--info` logging level.

====
----
$ gradle hello -PskipHello --info
include::{snippetsPath}/tutorial/taskOnlyIf/tests/taskOnlyIf-info.out[]
----
====