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Linux / UNIX: PHP mail() Error Log File

How do I view PHP mail() errors? How do I see php mail() error log file under UNIX or Linux?
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I'm testing Redhat Enterprise Linux 6 for our apps. However, RHN do not support beta RHEL 6 software. How do I use yum command to install additional software without using DVD ROM?
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I've root ssh access and need to add / delete a few IP address on fly using the IPtables command via local shell script. How do I add or delete an IP address remotely over the SSH session under CentOS / Redhat / RHEL / Debian / Ubuntu Linux?
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I've AMD Athlon II processors based server and it does not change frequency on all logical cores under CentOS version 5.5 or RHEL Linux. How do I fix this problem?
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Redhat / CentOS: ImageMagick Installation

How do I install ImageMagick under CentOS / Fedora / RHEL / Redhat Linux for displaying and manipulating images via perl, php, blog and other web based apps?
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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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Apache: Graceful Server Reboot From Shell

How do I gracefully restart Apache web server from a shell prompt?
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