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"));
  
      }
  }