C/environ

#include <stdio.h>
#include <stdlib.h>
 
extern char **environ;
 
int main(int argc, char *argv[]) {
  int i;
 
  printf("Arguments:\n");
  for (i = 0; i < argc; i++) {
    printf("  %3d: [%s]\n", i, argv[i]);
  }
 
  printf("\n");
 
  printf("Environment:\n");
  for (i = 0; environ[i] != NULL; i++) {
    printf("  %3d: [%s]\n", i, environ[i]);
  }
 
  return 0;
}