While the pipe example may just work, realize that in this case cmd
isn't executing a batch file per se, it's executing a sequence of
commands entered as though they were entered individually at the
command line.

IIRC batch files can contain some things that work differently (or
perhaps not at all) when entered on the command line, although I admit
that things may have changed in the 15 or so years since I've used MS
DOS. Testing the value of environment variables comes to mind.

The suggestion would however likely work with any Unix shell, which
doesn't typically make this kind of distinction.

/gordon

--

On Nov 12, 7:59 am, Arne Vajh?j <a...@vajhoej.dk> wrote:

Why not? Well, depending on what the OP wants, there may be issues, of
course. I just tried the following quick and dirty test and it seems
to work:

import java.io.*;
import java.util.*;
import static java.lang.System.out;

public class Bat {
 public static void main (String[] args) throws Exception {
   String bat =
     "echo Hello\n" +
     "set java=%SystemRoot%\\system32\\java.exe\n" +
     "set | find \"java\"\n" +
     "dir %java%\n";
   Runtime rt = Runtime.getRuntime ();
   Process process = rt.exec ("cmd");
   InputStream stderr = process.getErrorStream ();
   InputStream stdout = process.getInputStream ();
   OutputStream stdin = process.getOutputStream ();
   stdin.write (bat.getBytes ());
   stdin.close ();
   BufferedReader br;
   String line;
   br = new BufferedReader (new InputStreamReader (stdout));
   while ((line = br.readLine ()) != null)
     out.println ("stdout=" + line);
   br = new BufferedReader (new InputStreamReader (stderr));
   while ((line = br.readLine ()) != null)
     out.println ("stderr=" + line);
 }
}

Eugene