Executing shell commands in Java

Question

Hi
I have managed to get my Java program to execute the 'who' command and read in the data from running that command. However, how can I run this command with the '-m' option. I thought it would be
Process proc = rt.exec("who -m");However when I run this, I get no data. Is there another way of running this command.
Many thanks
Sambo

Answer 1

Thanks for the link, its actually the tutorial I looked at to start using the exec method.
try{
               Runtime rt = Runtime.getRuntime();
               Process proc = rt.exec("who");
               InputStream stderr = proc.getInputStream();
               InputStreamReader isr = new InputStreamReader(stderr);
               BufferedReader br = new BufferedReader(isr);
               File file = new File("input.txt");
               BufferedWriter out = new BufferedWriter(new FileWriter(file));
               while ((line = br.readLine())!=null){
                    temp = line.split("\\s+");
                    for (int i = 0; i < temp.length; i++){
                        //System.out.println(temp);
This is my current code, and I can get an output from that. But as soon as I add a argument to the who command, it doesn't display anything. The who command displays the current users logged into a Linux system.
I have tried
Process proc = rt.exec("who -m");and
Process proc = rt.exec("who ", "-m");But no luck.
Maybe I have to specify it as another argument, but not to sure how to do that.
Again many thanks