Is there a package for Linux that can run second-degree crontab

Question

The min time for a crond job is 1 minute, is there any package that has the same use as crontab and can set a second job

Seems none those kinds of tools exists, I will just modify crond for my own version, thanks, everyone. — forgaoqiang, Oct 12 '21 at 07:36

score 0 · Answer 1 · answered Jul 28 '21 at 17:03

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You can do it with SystemD on most modern Linux distributions. Please see this topic and the SystemD-specific answer in it: Running a cron every 30 seconds

answered Jul 28 '21 at 17:03

Gregory Morozov

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Thanks for the answer, I know that way, sleep with a delay, but does there any package that can do the second job itself? – forgaoqiang Jul 29 '21 at 02:54

score 0 · Answer 2 · answered Jul 28 '21 at 17:03

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Although there is no "real" way to run a job less than a minute with cron ... I have used this work-around for years with no issues. Say you wanted to run the cron every 30 secs. You set 2 processes to run every minute .. And set one to sleep for 30 secs. IE

* * * * *  sh /path/to/script/shell.sh
* * * * * ( sleep 30; sh /path/to/script/shell.sh )

Effectively running the cron every 30 seconds.

Conversely if you wanted it to run every 20 seconds:

* * * * *  sh /path/to/script/shell.sh
* * * * * ( sleep 20; sh /path/to/script/shell.sh )
* * * * * ( sleep 40; sh /path/to/script/shell.sh )

NOTE this is a work-around!

answered Jul 28 '21 at 17:03

Zak

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Thanks, I knows that trick, but does there any package has the ability to do the second job itself – forgaoqiang Jul 29 '21 at 02:53
If that is your question, then the definitive answer is no. :( – Zak Jul 29 '21 at 16:17
I check it in Google and GitHub, didn't found one, is that a great idea to just rewrite crond and publish a new package to do that job? – forgaoqiang Jul 30 '21 at 06:37

Is there a package for Linux that can run second-degree crontab

2 Answers2