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

int main(int argc, char *argv[]) {
   int sleeptime;
 
   if (argc != 2) {
      fprintf(stderr, "Usage:%s n\n", argv[0]);
      return 1;
   }
   sleeptime = atoi(argv[1]);
   fprintf(stderr, "Sleep time is %d\n", sleeptime);
   for ( ; ; ) {
      sleep(sleeptime);
      printf("\007");
      fflush(stdout);
   }
}