CODEWITHSUNDEEP
ruby-on-railsrubylinuxcron
palash-kulkarni
palash-kulkarni

Reputation: 407

Build a cron expression

I want to build a cron expression for following - which should run every two weeks and start from specific day of month.

I tried to build expression like this -

5 4 2/14 * * * (Here i want to run cron at 04:05 on every 14th day-of-month from 2 through 31)

Can somebody help?

Upvotes: 2

Views: 729

Answers (2)

Florian Heer
Florian Heer

Reputation: 704

So, you want it to run on the 2nd, then 14 days later, and again 14 days later? As this is not an enormous list, just give that list:

5 4 2,16,30 * *

Upvotes: 2

Jesus Cepeda
Jesus Cepeda

Reputation: 430

5 4 * * 1 test $(($(date +%W)%2)) -eq 1 && your_command

Ok, the tricky part to make it run every two weeks is to know what day of the week is the first 2nd. Let's imagine it is a Monday, this monday, and this week (number 13). We we'll focus on make it run every second monday.

5 4 * * 1 Every monday script or command works at 04:05

$(($(date +%W)%2)) Evaluates the numeric week expresion and gets his module (1 odd or 0 par)

test $(($(date +%W)%2)) -eq 1 True if the week is odd, we avoid par weeks. We can change it to -eq 0 in case of need it to work on par weeks

&& your_command If the previous condition works, your script or command runs

Upvotes: 0

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