UNIX for Dummies Questions & Answers

main(int argc, char *argv[])
{

   int i;

   char *array[2];
   char *arg1;
   char *arg2;

   printf("argc = %d\n", argc);

   for (i = 0; i < argc; i++)
      printf("argv[%d] = \"%s\"\n", i, argv[i]);

   if (argc != 3)
      return;

   arg1 = malloc(strlen(argv[1]) + 1);
   arg2 = malloc(strlen(argv[2]) + 1);

   strcpy(arg1, argv[1]);
   strcpy(arg2, argv[2]);

   printf("arg1 = %s\n", arg1);
   printf("arg2 = %s\n", arg2);

   array[0] = arg1;
   array[1] = arg2;

   printf("arg1 = %s\n", array[0]);
   printf("arg2 = %s\n", array[1]);

   free(arg1);
   free(arg2);

}

char **av=(char **)malloc(sizeof(char *)*(argc+1)); // create a char *[] big enough to hold argv

for(n=0; n<argc; n++)
        av[n]=strdup(argv[n]); // Allocates memory, copies string into it, gives you pointer

av[argc]=NULL;


// before your program quits
for(n=0; n<argc; n++) free(av[n]);

free(av);

./myprogram "this is argument 1" "this is argument 2" three four five six