I have the following cron in my crontab:
0 5 * * * wget -q -O /dev/null http://www.mysite.com/crontask.php
From what I understand, this is to run at 5am every day and only once. However, I have noticed JUST today that it is running every 15 minutes from 5am. I did edit the crontab yesterday on a different cron job so i'm wondering if perhaps that has caused some sort of knock-on effect which make the system interpret the line above different when it 'installed'.
As a responce to a query below. Here is a sample of the apache log (notice the incorrect time). I have masked the server IP address for security:
SERVERIPADDRESS - - [02/Mar/2011:05:15:04 +0000] "GET /crontask.php HTTP/1.0" 200 523 "-" "Wget/1.11.4 Red Hat modified" www.mysite.com
Here is the original:
SERVERIPADDRESS - - [02/Mar/2011:05:00:02 +0000] "GET /crontask.php HTTP/1.0" 200 523 "-" "Wget/1.11.4 Red Hat modified" www.mysite.com