package org.codehaus.mojo.exec;

 import java.util.ArrayList;

 import java.util.Collections;

 import java.util.List;

 import java.util.Properties;

 public class Foo {

     public static void main(String[] args) {

         Properties props = System.getProperties();

         List<String> keys = new ArrayList<String>(props.stringPropertyNames());

         Collections.sort(keys);

         for (String key : keys) {

             if (key.startsWith("os") || key.startsWith("java")) {

                 System.out.println(key + "=" + props.getProperty(key));

             } else {

                 System.out.println(key);

             }

         }

         System.out.println(props.getProperty("java.home"));

     }

 }