Can a cron job run every 'x' seconds

Question

I have a cron job setup, with the minimum value of 60 seconds, and I want the program to be able to run at second intervals i.e. whatever I set it as 60 seconds onwards.

Answer 1

cron.schedule('*/' + test + '0,x * * * * *', function () {
   console.log('running a task every x seconds');
});

this will run every x seconds.

Answer 2

If you're using middleware for Node, you can add seconds as well

cron.schedule('*/' + test + '0,30 * * * * *', function () {
    console.log('running a task every minute');
});

Will run every 30 seconds, i.e. on xx:00:000 and xx:30:000

Note that javascript versions have six values, and not five like native Linux Cron, meaning the sixth is for seconds, which would be the first one

*    *    *    *    *    *
┬    ┬    ┬    ┬    ┬    ┬
│    │    │    │    │    |
│    │    │    │    │    └ day of week (0 - 7) (0 or 7 is Sun)
│    │    │    │    └───── month (1 - 12)
│    │    │    └────────── day of month (1 - 31)
│    │    └─────────────── hour (0 - 23)
│    └──────────────────── minute (0 - 59)
└───────────────────────── second (0 - 59, OPTIONAL)

Full documentation on allowed values can be found in the crontab documentation