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 process standard output.

InputStream is = p.getInputStream();

int _byte;

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

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

// Obtaining process standard error.

is = p.getErrorStream();

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

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

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

}

catch (InterruptedException ie)

{

assert false; // should never happen

}

catch (IOException ioe)

{

System.err.println("I/O error: " + ioe.getMessage());

}

}

}