import java.io.*;
import java.util.*;

public class Command implements Runnable {
        String theCommand;
        //Initilize the command
        Command(String c){
                theCommand = c;
        }
        //start up the command
        public void  run() {
           try {
                if (theCommand.compareTo("exit") == 0) System.exit(0);
                // creat a process
                Process p = Runtime.getRuntime().exec(theCommand);
                // we need 2 threads to handle both standardoutput & erroroutput
                Thread output_thread[] = new Thread[2];
                output_thread[0] = new Thread(new Output(p,p.getInputStream()));
                output_thread[1] = new Thread(new Output(p,p.getErrorStream()));
                for (int i = 0; i < 2; i ++) {
                        output_thread[i].start();
                }
                for (int i = 0; i < 2; i ++) {
                        try {
                                output_thread[i].join();
                        } catch (InterruptedException e){
                                System.err.println(e);
                        }
                }
            } catch (IOException e) {
                        System.out.println(theCommand+" : Command not Found.");
            }
        }// end of run();
}// end of class Command;