An updated crontabs package that fixes one bug is now available for Red Hat Enterprise Linux 6.
The crontabs package contains root crontab files and directories. You will need to install the cron daemon to run the jobs from crontabs. The cron daemon such as cronie or fcron checks the crontab files to see when particular commands are scheduled to be executed. If commands are scheduled, it executes them. Crontabs handles a basic system function, so it should be installed on your system.
Prior to this update, an example included in the /etc/crontab file contained an omission. It did not state that defining a job in crontab requires a username to be defined. The missing information has been added to the /etc/crontab file in this update.
All users of crontabs are advised to upgrade to this updated package, which fixes this bug.