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displaying UNIX stdout in JAVA GUI

Posted on 2002-06-24
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Last Modified: 2012-05-04
I have a a simple GUI with
1. TEXT AREA
2. BUTTON

when I push the button, the program runs a simple UNIX command (for example, "who" or "ls")
I need to echo the results of that command to the text area.

I don't want to do this by redirection to a file ("ls > outputfile") and then opening the file for the textarea.

I want to do this in real time, if possible (For example, if the unix command is a long "grep", then the results would scroll on the text area.

is this possible to do???

By the way, I am using JAVA NATIVE to run the unix commands ('C' system call)
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Question by:happyloman
4 Comments
 
LVL 86

Accepted Solution

by:
CEHJ earned 200 total points
ID: 7104564
Careful - you've posted this several times!

import java.io.*;
public class Exec {
  public Exec(String cmdline) {
    try {
     String line;
     Process p = Runtime.getRuntime().exec(cmdline);
     BufferedReader input =
       new BufferedReader
         (new InputStreamReader(p.getInputStream()));
     while ((line = input.readLine()) != null) {
       System.out.println(line);
       // append to your TextArea here
       }
     input.close();
     }
    catch (Exception err) {
     err.printStackTrace();
     }
   }

public static void main(String argv[]) {
  new Exec("ls -l");
  }
}
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LVL 19

Expert Comment

by:cheekycj
ID: 7104794
Duplicate Question Experts please post comments here:
http://www.experts-exchange.com/java/Q_20315518.html

Happyloman: Please delete this question.

Thanx,
CJ
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LVL 9

Expert Comment

by:Ovi
ID: 7106677
0
 
LVL 1

Expert Comment

by:Moondancer
ID: 7109289
You posted this same question 11 times, and all have been closed.  Those which contained help to you we can leave, but others which were experts trying to alert you of the multiple entries, I'll refund for you.  Please use the "reload" button versus your Browser control buttons, and also don't hit submit more than once when creating a question.  

If you need help, any time, post a zero point question here:
http://www.experts-exchange.com/commspt/
Include the question link (URL)

Thank you,
Moondancer - EE Moderator
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