#include 
     
      #include 
      
       #include 
       
         //printf#include 
        
          //extern char **environusing namespace std;#include 
         
          #define _GNU_SOURCE#include 
          
           // THIS PROGRAM CAN ./program --env=HOME// ./program -e HOME// ./program --e HOME// ./program -h// ./program --h or ./program --helpextern char **environ;int main(int argc,char *argv[]){ /* cout << "Hello, World!" << endl; char *v_char = "houdini"; char *v_char_list[5]={"jack","luke"}; cout << v_char<