Example 3: Process Hierarchy #1 #include #include #include int main (int argc, char *argv[]) { pid_t childpid = 0; int i, n; if (argc != 2) { /* check for valid number of command-line arguments */ fprintf(stderr, "Usage: %s processes ", argv[0]); return 1; } n = atoi (argv[1]); for (i = 1; i <>