Cron job sends every minute instead of specefic time

Question

I have the following cron job:

* * 21 * * * wget -qO /dev/null http://myDomain/myController/myView

Which sends me a mail.

However as I can see from my now very full mail box I receive a mail every minute instead of every day at 21.00.

What am I doing wrong?

Answer 1

I found the answer.

Apprently the type of linux machine im running needs to be * */21 * * wget

Note the dash

Answer 2

You haven't specified a minute, so your cronjob will run every minute (*) at 21 hours, so 21:00 - 21:59.