Linux crontab format is not allowing to setup jobs to less then 1 minute. Use the sleep command to do it:

*/1 * * * * /path/to/my/script
*/1 * * * * sleep 20 && /path/to/my/script
*/1 * * * * sleep 40 && /path/to/my/script

On this example cron daemon will run the job every 20 seconds.

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