import java.io.*;
import java.util.concurrent.CountDownLatch;

public class EndlessLoop {
    public static void main(final String[] args) throws InterruptedException {
        if (args.length == 0) {
            int cnt = 0;
            while (true) {
                System.err.print(".");
                Thread.sleep(2000);
                if (++cnt > 80) {
                    cnt = 0;
                    System.err.println();
                }
            }
        } else {
            int threadCount = Integer.parseInt(args[0]);
            final CountDownLatch latch = new CountDownLatch(threadCount);
            for (int i = 0; i < threadCount; i++) {
                final int id = i;

                new Thread() {
                    @Override
                    public void run() {
                        latch.countDown();
                        try {
                            latch.await();
                            System.out.println("running cmd: '" + args[1] + "'");
                            Process process = Runtime.getRuntime().exec(args[1]);

                            FileWriter out = new FileWriter("out"+id+".txt");
                            InputStream pstream;
                            int read;
                            pstream = process.getErrorStream();
                            while ((read = pstream.read()) != -1){
                                out.write(read);
                            }
                            pstream.close();
                            out.close();

                            process.waitFor();
                            System.out.println("Process " + id + ": " + process.exitValue());
                        } catch (Exception e) {
                            e.printStackTrace();
                        }
                    }
                }.start();
            }
        }
    }
}