// tag::task[]
abstract class GreetingToFileTask : DefaultTask() {

    @get:OutputFile
    abstract val destination: RegularFileProperty

    @TaskAction
    fun greet() {
        val file = destination.get().asFile
        file.parentFile.mkdirs()
        file.writeText("Hello!")
    }
}
// end::task[]

// tag::config[]
val greetingFile = objects.fileProperty()

tasks.register<GreetingToFileTask>("greet") {

abstract class GreetingToFileTask extends DefaultTask {

    @OutputFile
    abstract RegularFileProperty getDestination()

    @TaskAction
    def greet() {
        def file = getDestination().get().asFile
        file.parentFile.mkdirs()
        file.write 'Hello!'
    }
}
// end::task[]

// tag::config[]
def greetingFile = objects.fileProperty()

tasks.register('greet', GreetingToFileTask) {

This will enable lazy configuration so that the actual location will only be resolved when the file is needed and can be reconfigured at any time during build configuration.

This Gradle build file defines a task `GreetingToFileTask` that writes a greeting to a file.
It also registers two tasks: `greet`, which creates the file with the greeting, and `sayGreeting`, which prints the file's contents.