get the output from whoami

[gary]

Hello, this is my first post so please be patient with me.

I am quite new to java and I am trying to get the output of a whoami
command into a String variable.
normally I use
Process p = Runtime.getRuntime().exec("whoami");

but with the whoami command all I get is

java.lang.UNIXProcess@79bbdc

[levent]

Hello Gary,

If you have Java 5 and above you should use ProcessBuilder instead of Runtime.exec(). Here is an example program for your purpose:

Code:

   import java.io.*;
   import java.util.*;
   
   public class DoProcessBuilder {
     public static void main(String args[]) throws IOException {

       if (args.length <= 0) {
         System.err.println("Need command to run");
         System.exit(-1);
       }

       Process process = new ProcessBuilder(args).start();
       InputStream is = process.getInputStream();
       InputStreamReader isr = new InputStreamReader(is);
       BufferedReader br = new BufferedReader(isr);
       String line;

       System.out.printf("Output of running %s is:", 
          Arrays.toString(args));

       while ((line = br.readLine()) != null) {
         System.out.println(line);
       }

     }
    }

You can run it with "java DoProcessBuilder whoami".

Let us know if you have any other problems.

[gary]

Thank you very much.