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How To: Upgrade CentOS Linux 5.3 to v5.4

How do I upgrade CentOS Linux from version 5.3 to latest version 5.4 over the Internet?
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Ubuntu Linux: View Boot Log

How do I view detailed boot log of my Ubuntu system?
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My home Linux laptop is connected to ADSL router and whenever I run route -n command at the prompt it says 0.0.0.0 is set to my routers IP 192.168.1.1. What is the meaning of 0.0.0.0?
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Ubuntu Linux: Find Out Default Gateway

How do I find out default gateway IP address (default router IP assigned) for my Ubuntu Linux systems?
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I would like to dynamically enable or disable a CPU on a running system. How do I hotplug a CPU on a running Linux system? How do I disable cpu cores on a Linux operating system at run time?
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CentOS Add Route Command

How do I add route (router IP 192.168.1.254) to my Centos Linux systems from the command line?
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Q. I was reading this article and wanted to try out KVM, XEN, VMWare and VirtualBox simultaneously on my desktop system with 2GB RAM? Why I'm not able to use run multiple virtualization technologies simultaneously under Ubuntu Linux? Can a powerful Linux server run multiple virtualization technologies simultaneously?
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