How to Run BASH script from Gradle Task?

build.gradle

task hello(type: Exec) {
  executable "sh"
  args "-c", "echo 'hello from your shell'"
}

How to pass path of sh file?
None of these worked for me:

task runInstrumentationTestsOnTestLab(type: Exec) {
    //commandLine 'sh', './instrumentationTestLab.sh'
    /*doLast {
        exec {
            executable ".././instrumentationTestLab.sh"
        }
    }*/
    //Runtime.getRuntime().exec("./instrumentationTestLab.sh")
    /*preBuild.doFirst {
        println("Executing myScript")
        def proc = "./instrumentationTestLab.sh".execute()
        proc.waitForProcessOutput(System.out, System.err)
    }*/
    /*preBuild.doFirst {
        println("Executing runInstrumentationTestsOnTestLab")
        def proc = Runtime.getRuntime().exec("./instrumentationTestLab.sh")
        proc.waitForProcessOutput(System.out, System.err)
    }*/
    //commandLine 'sh ./instrumentationTestLab.sh'
    executable "sh"
    args "-c", "./instrumentationTestLab.sh"
}

thanks a lot for your help, you saved my day about the shell scripts

This doesn't seems to work with latest gradle version.