import java.io.InputStream;

import java.io.IOException;

public class Exec{

public static void main(String[] args) {

if(args.length != 1){

System.err.println("usage: java Exec program");

return;

}

try{

Process p = Runtime.getRuntime().exec(args[0]);

// Obtaining standard output of process that p represented.

InputStream is = p.getInputStream();

int _byte;

while((_byte = is.read())!=-1){

System.out.print((char)_byte);

}

// Wait for the executing process's exit status.

System.out.println("\nExit status: " + p.waitFor());

}catch(InterruptedException ie){

assert false;

}catch(IOException ioe){

ioe.printStackTrace();

}

}

}