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- Quick Command Reference
http://www.pixelbeat.org/cmdline.html - Debian Package Management
http://qref.sourceforge.net/Debian/reference/ch-package.en.html - Vi Reference Card
http://www.digilife.be/quickreferences/QRC/Vi%20Reference%20Card.pdf
http://tnerual.eriogerg.free.fr/vim.html - Regular Expression
http://gnosis.cx/publish/programming/regular_expressions.html
http://www.linuxforums.org/applications/demystifying_regular_expressions.html
- Find a text within files
command: grep -R <text> *
example: grep -R korea *
