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Wait... Why is this being done on a live CD? Nothing done on a live CD will persist after a reboot. You need to install the operating system first instead of running it off the CD. This also does not look like a typical CentOS terminal, it looks more like Ubuntu.
Do you have any insight into this? Are you actually using an Ubuntu liveCD? In either case you will need to install this on a system or a VM which will be able to retain your changes and configurations.