How can you disable the automatic sending of mails to the sysadmin in linux/unix each time a task is run in the crontab list?
I found the solution thanks to a very useful explanation between adding:
to a cron task.
Both of them avoid that an email is sent everytime a task is completed. But in the second case it will also avoid sending error mails.
Read the details here http://www.mydigitallife.info/cron-differences-between-devnull-21-and-devnull/
The mails are sent if you don’t use either of those two at the end of the cron task. I didn’t know it and was receiving tons of alerts, since I have a cron every two minutes!