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linux yum command

Q. I've installed Red Hat Enterprise Linux 5.2 and I see virbr0 network interface along with my eth0 interface? What it is? How do I disable or remove virbr0?
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I would like to only download the packages via yum and not install/update them. How do I download a RPM package using yum command under CentOS Enterprise Linux server 5.x or RHEL 5.x systems?
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Q. I know how to find out current running kernel version under CentOS Enterprise Linux 4.6 x86_64, but how do I find out latest available kernel version? How do I find out if it's the latest one? How to find the latest release version for package called xyz or kernel package?
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Linux yum command deleted

Q. By accident my yum command was deleted under Red Hat Enterprise Linux version 5.x. Now I'm not able to download and update system using RHN. How do I fix this issue without reinstalling RHEL again?
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How do I use yum command to update and patch my Red hat Enterprise Linux / CentOS Linux version 5.x server via RHN / Internet? Can I use up2date command under RHEL 5?
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Q. How can I apply package updates from Red Hat Network (RHN) for my HP Red Hat Enterprise Linux Server?
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