Two schemes of implementing second-level scheduled tasks under Linux

Two scenarios for implementing second-level scheduled tasks under Linux (Crontab runs per second):

The first scenario, of course, is to write a script that runs in the background all the time, and then loop through sleep for a while.

While True;d o

Command

Sleep XX//interval of seconds

Done

The second option is to use crontab.

We all know that the granularity of crontab is up to the minute, but we can still run it in a few seconds by doing it in a flexible way.

The following methods are executed every 20 seconds

Crontab-e
* * * * * */bin/date
* * * * * * sleep 20; /bin/date
* * * * * * sleep 40; /bin/date

Description: Need to change/bin/date to your command

This approach to deal with the dozens of-second scheduled task is OK, if run every 1 seconds to add 60 records ... If you run it every second or plan one.