How to run the crontab file on the server once every 30 seconds?

Question

Task Schedulers

It is known that crontab files on the server are launched with a maximum frequency of 1 minute.
There is a need to run them every 30 seconds. Is it possible to solve this problem by running two files, but put a delay of 30 seconds on one. As a result, we get the execution of the file with an interval of 30 seconds.
So here's the question. Is it possible to specify in the instructions for running a file that it should be executed with a delay of 30 seconds? If this option is not possible, please indicate possible solutions.

Answer 1

You can try postponing like this:

* * * * * /var/www/somescript.sh
* * * * * ( sleep 30 ; /var/www/somescript.sh )