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Vi / Vim: Quit Without Saving Command

I am a new vi / vim text editor user. How can I quit the vi / vim text editor without saving my changes to a file under Linux / Unix like operating systems?
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What Is SELinux?

What is SELinux? Why should I use SELInux on my CentOS or Red Hat Enterprise Linux server running on IBM hardware?
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I am using CentOS 5 on my laptop. If I open gnome-terminal by right clicking the desktop, I am getting an error that read as follows:

There was an error creating the child process for this terminal

How do I fix this problem and open a terminal by right clicking the Debian / Ubuntu / CentOS / Fedora / RHEL / Red hat Enterprise Linux 5.x desktop system?
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I need to replace special characters with equivalent hexadecimal unicode under Linux or Unix like operating system. How do I list or find out unicodes for given characters?
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I have lots of images in png format (over 250k+ png). Properly formatting and compressing png images can save many bytes of data. How do I compress and optimize png images on my amazon cloud account so that I can save bandwidth on cloudfront cdn account? How do I use an image compressor to create lossless compression on PNG files, with no effect on image quality in bulk using Red Hat Enterprise Linux bash shell?
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How do I find out my DNS server IP address assiged my my ISP under Unix or Linux operating system using command prompt? How do I find preferred dns server under Debian / Ubuntu / Fedora Linux desktop system?
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HowTo: Install firefox-15.0.tar.bz2 in Linux

Idownloaded Firefox version 15.0 from mozilla ftp server. The name of file is firefox-15.0.tar.bz2. How do I install Firefox under any Debian / Ubuntu / Fedora or any Linux distribution?
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