Direct CMD output to a file

[yahyaaa]

Dear Forum

I want to direct the output of command "dir" to a file using java..

import java.io.*;

public class Exec {

    public static void main(String[] args) throws IOException {

        Process p = Runtime.getRuntime().exec("cmd /c  start dir");
       // OutputStream outstr = p.getOutputStream();
        BufferedReader in = new BufferedReader(new InputStreamReader(p.getInputStream()));

        BufferedWriter fw = new BufferedWriter(new FileWriter("c:\\cmdout.txt"));

        String line = null;
        while ((line = in.readLine()) != null) {
            System.out.println(line);
            fw.write(line);
        }
        fw.close();

    }
}

direct the cmd command to cmdout.txt file

Can you please help...

[Eranga]

dir command list the content, and seems to me you want to read something to a file. What's the connection?

[yahyaaa]

Yes exactly, this is a simple program that I wrote, im not using a connection.. it just a normal cmd... I will then use tellnet command to excute command from client to SUN server

[Eranga]

No, what I'm asking is what you want to do exactly?

[yahyaaa]

ok.. Im sorry..

I want to telnet to a unix based server and excute command (ex. ls- ltr) and I want to set the output in buffer to use it in that program

[Eranga]

That's something you want to execute a program in a different machine, is it?

If so, you cannot do that in a direct way. You may need to run your own client in that machine, and manipulate that with HTTP request or similar.

[yahyaaa]

Thank you for your input,
But wht if Im doing it in same machine, as in my example, I'm excuting a basic cmd command but im not able to direct the output to a file..

Thanks again

[JosAH]

Thank you for your input,
But wht if Im doing it in same machine, as in my example, I'm excuting a basic cmd command but im not able to direct the output to a file..

My guess is that the 'start' command spoils the show; try "cmd /c dir" instead.

kind regards,

Jos

[yahyaaa]

You were absolutely right.. it was "start" command...
but why ? what was the reason behind it ?

Also, if I want to excute a command on a unix machine ? how can I open the shell ?

really appreciate your help

[JosAH]

You were absolutely right.. it was "start" command...
but why ? what was the reason behind it ?

Also, if I want to excute a command on a unix machine ? how can I open the shell ?

really appreciate your help

The 'start' command (as its name implies) starts another process; my guess was that it supplies new stdin, stdout and stderr streams for the new process. Your Java process listens to the stdin, stdout and stderr streams of the start command itself.

You can open a unix shell just like you can start a shell/command line interpreter on an MS Windows machine, e.g. bash, csh, bsh, whatever.

kind regards,

Jos