countup.c

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

int main(void) {
  int i;
  useconds_t delay = 20000;
  fprintf(stderr, "Begin counting up.\n");
  for(i = 1; i <= 100; i++) {
    fprintf(stderr, "%d\r", i);
    fflush(stderr);
    usleep(delay);
  }
  fprintf(stderr, "\n");
  fprintf(stderr, "End counting up.\n");
  return 0;
}