exec cron with
exec cron -L 15 the run
sudo service cron reload,
sudo service cron restart but nothing changed. Cron doesn't log the end of jobs and doesn't log failed jobs. I hade no problem in Ubuntu 14.04, but now I have this problem in Ubuntu 16.04. What do I do wrong?
Step by Step: First I changed /etc/init/cron.conf:
sudo sed -i 's|exec cron$|exec cron -L15|' /etc/init/cron.conf && sudo restart cron && cat /etc/init/cron.conf
So now it is
$ cat /etc/init/cron.conf # cron - regular background program processing daemon # # cron is a standard UNIX program that runs user-specified programs at # periodic scheduled times description "regular background program processing daemon" start on runlevel  stop on runlevel [!2345] expect fork respawn exec cron -L 15
I made the same config in my Ubuntu 16.04 as well as on Ubuntu 14.04 on the another PC.
The Cron log in Ubuntu 14.04 is the following:
$ grep CRON /var/log/syslog Aug 26 16:05:01 y1404 CRON: (y) CMD (foo # JOB_ID_1) Aug 26 16:05:01 y1404 CRON: (CRON) error (grandchild #6825 failed with exit status 127)
So you can see the second line with error notification about nonexistent command
foo. But in Ubuntu 16.04 there is no error notification in the log:
Aug 26 16:25:01 my CRON: (y) CMD (foo # JOB_ID_129)