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
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If you want to know if it's running you can do something like
sudo systemctl 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)
New information for 2020: cron is now a systemctl service, so you can have the logs of cron / anacron with:
journalctl -u cron.service
if you did install anacron, it is the same with:
journalctl -u anacron.service
(anacron is for desktop, when your computer is not garanteed to be always on. It enforce that even if your computer is down at 5'00, daily jobs are run when the computer has started up).