Executing multiple UNIX commands

Question

Hello
I would like to execute from a Java application the UNIX command :
ls -l | grep ob
I first execute the command "ls -l" and write the output stream in the input stream of the command "grep ob"
My problem is that the second command is waiting for the EOT character and i don't know how to send it. I tried to write the char 4 but it doesn't work
Any idea to run commands with pipes ?
Chris

Answer 1

I reply to myself in case someone else wants to do that job :
    private static byte[] execUNIXcmd(String commande, byte[] outputData, boolean closeStream) {
     Runtime runtime = Runtime.getRuntime();
     Process process = null;
     InputStream inputStream = null;
     OutputStream outputStream = null;
     byte[] bBuf = null;
     try {
         process = runtime.exec(commande);
         outputStream = process.getOutputStream();
         inputStream = process.getInputStream();
         if (outputData != null) {
          outputStream.write(outputData);
         if (closeStream) {
          outputStream.close();
         inputStream = process.getInputStream();
         process.waitFor();
         bBuf = new byte[inputStream.available()];
         inputStream.read(bBuf, 0, inputStream.available());
         return bBuf;
     } catch (InterruptedException e) {
         System.err.println("ERROR : Enable to wait the process");
         return null;
     } catch (IOException e) {
         System.err.println("ERROR : Enable to read input lines");
         return null;
    // Fonction principale
    public static void main(String s[]) {
     byte[] result = null;
     result = execUNIXcmd("ls -l", null, false);
     result = execUNIXcmd("grep java", result,true);
     result = execUNIXcmd("grep ~", result,true);
     System.out.println(new String(result));
    }I missed to close the outputStream of the command waiting for it.
Chris