01-18-2008
If root edits the files directly, changes will not take effect in most cases and can even be lost. With most versions of cron, the answer to the question is "in memory". Those files are read only as cron starts up. The alternative would be to reread them every minute which would put quite a load on the system. It is critical that you use the crontab command to view and change those files. The crontab command interacts with cron to change the tables in cron's memory.
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LEARN ABOUT CENTOS
yum-cron
yum-cron(8) yum-cron(8)
NAME
yum-cron - an interface to convieniently call yum from cron
SYNOPSIS
yum-cron [config-file]
DESCRIPTION
yum-cron is an alternate interface to yum that is optimised to be convenient to call from cron. It provides methods to keep repository
metadata up to date, and to check for, download, and apply updates. Rather than accepting many different command line arguments, the dif-
ferent functions of yum-cron can be accessed through config files.
config-file is used to optionally specify the path to the configuration file to use. If it is not given, the default configuration file
will be used. It is useful to be able to specify different configuration files for different use cases. For example, one configuration
file might be set to update the repository metadata, and a line could be added to the crontab to run yum-cron frequently using this file.
Then, another configuration file might be set to install updates, and yum-cron could be run from cron using this file just once each day.
FILES
/etc/yum/yum-cron.conf
/etc/yum/yum-cron-hourly.conf
SEE ALSO
yum (8)
AUTHORS
See the Authors file included with this program.
BUGS
There of course aren't any bugs, but if you find any, you should email
the mailing list, yum@lists.baseurl.org, or consult bugzilla.
Nick Jacek yum-cron(8)