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/etc/init.d/yum-updatesd

The yum command line tool is used to install and update software packages under RHEL / CentOS Linux server. I know how to apply updates using yum update command line, but I'd like to use cron to manually update packages where appropriate. How do I configure yum to install software patches / updates automatically with cron?
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I'm running the command yum update -y and getting the following error:

Loaded plugins: fastestmirror, priorities
Existing lock /var/run/yum.pid: another copy is running as pid 523.
Another app is currently holding the yum lock; waiting for it to exit...

The other application is: yum-updatesd-he
Memory : 14 M RSS ( 26 MB VSZ)
Started: Tue Feb 9 08:19:02 2010 - 14 day(s) 11:47:39 ago
State : Sleeping, pid: 523
Another app is currently holding the yum lock; waiting for it to exit...
The other application is: yum-updatesd-he
Memory : 14 M RSS ( 26 MB VSZ)
Started: Tue Feb 9 08:19:02 2010 - 14 day(s) 11:47:41 ago
State : Sleeping, pid: 523

How do I fix this problem?
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I know how to send package update email notification under Debian / Ubuntu Linux. How do I send Automatic Email Notification under RHEL v4/5, CentOS, Red Hat and Fedora Linux, when security & package updates available? How do I force yum to send an email when upgrades available?
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