I went to
/var/log/cron but this file is empty.
How to check if crontab is enabled or is running properly or not in ubuntu
If you want to want to know if it's running you can do something like
sudo status cron or
ps aux | grep cron.
If you want to know if your cron jobs are running, check
/var/log/syslog with the process name cron. For example:
Apr 26 21:17:01 example CRON: (root) CMD ( cd / && run-parts --report /etc/cron.hourly)
sudo service rsyslog restart
service cron restart
now you can check cron log from file
By default the cron log in Ubuntu is located at
/var/log/syslog. Use the below command to check the cron entries in this file.
grep cron /var/log/syslog