I like to run every 3 mnth a shell script

[Canedje]

I do like to run every 3 mnth at 23:00 hr a shellscript called fileconv.sh
I did make a crontab command like:

0 23 * */3 * sh /home/ewh/fileconv.sh

Is this right?
Thanks in advance

[pcmanbob]

That cron line would run your script every day of every third month at 23:00

if you only want it to run once a month then you need to specify a day as well

for example on the 1st day of the month.

0 23 1 */3 * sh /home/ewh/fileconv.sh

[Canedje]

Thanks for the help
I will change the script

[DougieLawson]

Or look at Remind which can run a script based on any calendar date.
https://www.roaringpenguin.com/wiki/index.php/Remind

sudo apt install remind

[deepo]

https://crontab-generator.org/ is good, it will tell you when the script will run.

/Mogens