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Yum Command Check and Apply Only Security Updates

How do I only lists and/or updates to be limited using security relevant criteria when I run the yum command under CentOS / RHEL based server system?
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CentOS / RHEL: yum Command Reinstall Package

I accidental deleted the configuration file stored in /etc/ directory and the latest backup were made yesterday. How do I resinstall the package using the yum command under RHEL / CentOS Linux server?
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RHEL Warning: RPMDB altered outside of yum

When I try to update my server using the yum command I’ve been seeing the following error / warning message:

yum install aide
Loaded plugins: rhnplugin
Setting up Install Process
Resolving Dependencies
--> Running transaction check
---> Package aide.x86_64 0:0.14-3.el6 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

=============================================================================================================================================================================================
 Package                                Arch                                     Version                                        Repository                                              Size
=============================================================================================================================================================================================
Installing:
 aide                                   x86_64                                   0.14-3.el6                                     rhel-x86_64-server-6                                   123 k

Transaction Summary
=============================================================================================================================================================================================
Install       1 Package(s)

Total download size: 123 k
Installed size: 0  
Is this ok [y/N]:

Downloading Packages:
aide-0.14-3.el6.x86_64.rpm                                                                                                                                            | 123 kB     00:00     
Running rpm_check_debug
Running Transaction Test
Transaction Test Succeeded
Running Transaction
Warning: RPMDB altered outside of yum.
  Installing : aide-0.14-3.el6.x86_64                                                                                                                                                    1/1 

Installed:
  aide.x86_64 0:0.14-3.el6

How do I fix this problem?
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Linux /boot: Out of Disk Space While Installing Package kernel-2.6.32-131.2.1.el6.x86_64

I‘m trying to install RHEL 6 kernel updates and patches using the yum command and getting the following error:

Transaction Check Error:
  installing package kernel-2.6.32-131.2.1.el6.x86_64 needs 8MB on the /boot filesystem

Error Summary
-------------
Disk Requirements:
  At least 8MB more space needed on the /boot filesystem.

How do I fix this error and install RHEL kernel without increasing /boot size or reinstalling the operating system?
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Redhat / CentOS Install whois client

How do I install whois client to see whois information about domain and ip address using command line options under Fedora / RHEL / Redhat / CentOS / Scientific Linux?
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Verify: SSL Certificate Under OpenSSL

All UNIX / Linux applications linked against the OpenSSL libraries can verify certificates signed by a recognized certificate authority (CA). How do I verify SSL certificates using OpenSSL command line toolkit itself under UNIX like operating systems without using third party websites?
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