Having trouble in running a unix command and getting the output

Question

Hi,
I am trying to run a unix command from within the java code. I am not able to make it work. I am enclosing the code and the error message that I am getting. Any help is highly appreciated.
import java.io.*;
public class RunCommand {
    public static void main(String args[]) {
        String s = null;
        try {
            Process p = Runtime.getRuntime().exec("cat UNIX_ASCII_TEXT_FILE | A_UNIX_PROGRAM -d");
            BufferedReader stdInput = new BufferedReader(new InputStreamReader(p.getInputStream()));
            BufferedReader stdError = new BufferedReader(new InputStreamReader(p.getErrorStream()));
            // read the output from the command
            System.out.println("Here is the standard output of the command:\n");
            while ((s = stdInput.readLine()) != null) {
                System.out.println(s);
            // read any errors from the attempted command
            System.out.println("Here is the standard error of the command (if any):\n");
            while ((s = stdError.readLine()) != null) {
                System.out.println(s);
            System.exit(0);
        catch (IOException e) {
            System.out.println("exception happened - here's what I know: ");
            e.printStackTrace();
            System.exit(-1);
}The error message that I am getting is
Here is the standard output of the command:
SLu|%%$$=
Here is the standard error of the command (if any):
cat: cannot open |
cat: cannot open A_UNIX_PROGRAM
cat: cannot open -dLooks like the cat command is working and not the pipe command and the command after the pipe. But when I run the UNIX command from the command prompt I get the expected result.

Answer 1

You might read this article and see if its approach works.
http://www.javaworld.com/javaworld/jw-12-2000/jw-1229-traps.html