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configuring crontab to run specific days of the month only (comma separated day numbers)

doolyo asked
Last Modified: 2010-08-05
I would like to configure a cron task to be run only the 1st and the 15th of the month (let's say in /etc/crontab).
I have tried this specification:
09 20 1,15 * * root /root/scripts/myscript.sh

This makes it still run every day instead of the days specified with the comma separator. It probably comes from the fact that there are the days number specifiers AND the days in the week specifiers, and that the second is put to * which means each day.
This is what happens on my system: it is run every day instead of the specified 1 and 15 numbers.
Can someone help me?
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