Question

How can I run cron every 1 second? there’s only minutes option by default

Answer 1

Let cron start the job one time, the first time. Put the program in an infinite loop, sleep() for 1 second at the end of each loop. like this, in C:

  int main( int argc, char ** argv ) {
      while (1) {
        // do the work
        sleep(1000);
      }
  }

Could that work?