#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>

int main(int argc, char **argv)
{
volatile int modified;
char buffer[64];
char *variable;

variable = getenv("GREENIE");

if(variable == NULL) {
errx(1, "please set the GREENIE environment variable\n");
}

modified = 0;

strcpy(buffer, variable);

if(modified == 0x0d0a0d0a) {
printf("you have correctly modified the variable\n");
} else {
printf("Try again, you got 0x%08x\n", modified);
}

}