unix - Cron Job is not working to automatically run a script every 12 hours

Question

I have made a cron job using crontab -e and it is supposed to exec after every 12 hours. For some reason, it is not working.

I want to execute a script that monitors a particular subdomain and the script works when I run it separately so I know there are no problems with the script.

Here is the output of crontab -e:

0 12 * * */1 /root/tools/Monitor/monitor.sh

I checked the error log using grep CRON /var/log/syslog and here is the latest error that I see: Jan 23 19:39:01 savxiety CRON[232193]: (root) CMD ( [ -x /usr/lib/php/sessionclean ] && if [ ! -d /run/systemd/system ]; then /usr/lib/php/sessionclean; fi)

I have tried a lot of things, asked from some friends, checked out another question on SO but couldn't get this one working.

Thanks :)

OK, if you add a line like date > /tmp/last-started.txt as first statement to /root/tools/Monitor/monitor.sh, do you get a confirmation that the jobs was started?

• Yes I do get a confirmation that the script was run. This happens via a notification to my discord because of the | notify in the script.

I just saw that: What is */1 in crontab expected to do?

• Check this page out - https://crontab.guru/#1_*_*_*

So */1 does not make any sense and you say your script is started. So what's the problem? – U. Windl

• The problem is that my script is not starting every 12th hour and I think that is happening because of a problem in my cron configuration. To verify that it ran, I get a ping on my discord server that the script ran successfully, but after 12 hours, I don't get pinged for some reason which means that the script did not run after the 12 hour period.

question from:https://stackoverflow.com/questions/65863743/cron-job-is-not-working-to-automatically-run-a-script-every-12-hours

Answer 1

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