public static void main(String[] args) throws Exception {
// Read and output 3 lines
ProcessBuilder builder = new ProcessBuilder("head", "-n", "3");
final Process process = builder.start();
// Pump pump = new Pump(process.getInputStream(), System.out);
// pump.start();
// System.out.println("Started to pipe System.in.");
Pump pump = new Pump(System.in, process.getOutputStream());
pump.start();
IOUtils.copy(process.getInputStream(), System.out);
// new Pump(System.in, process.getOutputStream()).run();
// IOUtils.copy(System.in, process.getOutputStream());
process.waitFor();
// System.in.close();
System.out.println("Process finished.");
}
