Execute system command from gradle

build.gradle

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

    //store the output instead of printing to the console:
    standardOutput = new ByteArrayOutputStream()


    ext.output = {
        return standardOutput.toString()
    }

    doLast {
        print standardOutput.toString()
    }
}