sleepsh/main.c

#define SLEEP_SECONDS 20

#include <unistd.h>

int main() {
  while (1) {
    sleep(SLEEP_SECONDS);
    // fd 1 = stdout fd number
    //  "*" = symbol to print
    //    1 = size of a string to print
    write(1, "*", 1);
  }
  return 0;
}