egrep command

Recently Debian Linux version 7.0 (“Wheezy”) released. This version shipped with many new features – improvements to multimedia support, improved security through hardening flags and the OpenStack suite and the Xen Cloud Platform to name a few. How do I upgrades from Debian Linux version 6.x.x (squeeze) to the latest version 7.0.0 wheezy using command line options? How do I upgrade my Debian 6.x server to 7.x over the ssh session?
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How do I create a bootable USB pen drive to start my CentOS / Fedora Linux? How do I create a bootable USB flash pen for installation of Linux, and for creation of rescue and other special-purpose boot disks using command line options?
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