executing linux commands through java socket

Hi,

I need to connect th elinux machine through socket and need to execute the linux commands using java when i run the java application from any machine.I tried the following.But i am unable to execute the command when i run the program from windows.But if i run the program from linux,it works well.please correct me where am i wrong and please assist me to do this.

import java.io.*; import java.net.Socket; public class RunCommand { public static void main(String args[]) { String s = null; try { // run the Unix "ps -ef" command Socket s1=new Socket("192.168.1.101",5038); PrintWriter wr=new PrintWriter(new OutputStreamWriter(s1.getOutputStream()),true); wr.println("Hi Server..."); wr.flush(); BufferedReader br=new BufferedReader(new InputStreamReader(s1.getInputStream())); System.out.println(br.readLine()); Process p = Runtime.getRuntime().exec("ps -ef"); 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); } } }

when running the above code,i am getting the following error:

Asterisk Call Manager/1.0
exception happened - here's what I know:
java.io.IOException: Cannot run program "ps": CreateProcess error=2, The system cannot find the file specified
at java.lang.ProcessBuilder.start(Unknown Source)
at java.lang.Runtime.exec(Unknown Source)
at java.lang.Runtime.exec(Unknown Source)
at java.lang.Runtime.exec(Unknown Source)
at RunCommand.main(RunCommand.java:20)
Caused by: java.io.IOException: CreateProcess error=2, The system cannot find the file specified
at java.lang.ProcessImpl.create(Native Method)
at java.lang.ProcessImpl.<init>(Unknown Source)
at java.lang.ProcessImpl.start(Unknown Source)
... 5 more

Thanks

the reason why you are getting this exception is because java is trying to execute the command in the same jvm [windows] itself, and not the remote linux machine as you intended to/wanted to. You might want to get your hands on any of the free ssh libraries available on the net [trilead, is a personal favourite of mine... or even openssh]. Once you have this library [a jar basically], you can invoke the apis provided [create a session with the IP and port of the remote linux box] , and execute the commands.... trust me, it is pretty simple.

Dawn.

As you have said that in linux its working find and not in windows, the reason is windows does not have any command as ps.