I was working with my older operating system, Ubuntu 12.04 with Luna on it, for the past 2 years. I really enjoyed it, but as with all new things which we learn, we usually break also many things. On the other side, I learned a lot about Linux system administration while using it. So rather than fixing hacked system, I recently installed a new version of centOS 7 with GNU GUI on my PC. I will try to document some of the tasks of setting up the system. So here we come. :) There are some differences in commands on Ubuntu and CentOS based system and I will try to show commands for both systems.
PS: If you spot any errrors, I apologise and I would be grateful, if you could report them back to me. Thanks.