private int chmod(File serviceFile, String mode) throws Exception {
ProcessBuilder builder = new ProcessBuilder();
builder.command("chmod", mode, serviceFile.getCanonicalPath());
Process p = builder.start();
PumpStreamHandler handler = new PumpStreamHandler(io.inputStream, io.outputStream, io.errorStream);
handler.attach(p);
handler.start();
int status = p.waitFor();
handler.stop();
return status;
}