MyEnvironment.java

import java.util.*;
import java.security.*;

public class MyEnvironment {
  
  public static void main (String[] args) {
    Map<String, String> m = System.getenv();
    for(String k : m.keySet()) {
      System.out.printf("%s = %s\n", k, m.get(k));
    }
  }
  
}