"vi is a free software screen-oriented text editor written by Bill Joy in 1976 for an early BSD release. derived from the shortest unambiguous abbreviation for the command visual in ex; the command in question switches the line editor ex to visual mode. (Ex was a Unix editor that could switch between visual and command-line modes - the command line mode was to maintain some backward compatibility with an even earlier Unix editor called ed. vi is generally understood to be a modal editor: it operates in either insert mode (where typed text becomes part of the document) or command mode (where keystrokes are interpreted as commands that control the edit session)." [edit]
"vi is a free software screen-oriented text editor written by Bill Joy in 1976 for an earl...
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This is one of the oldest editors that has survived many others and fads. If you're programming and use command lines on a regular basis this is the one to learn.
It takes a bit of patience to learn the key commands to do various things, and there is a key-sequence for pretty much anything you want. But once you learn these, you can type and code so fast it keeps your focus on what you're doing instead of thinking which menu to click. The editor is designed to work without the mouse and this speeds things up.
To learn more about the commands check out
http://www.eng.hawaii.edu/Tutor/vi.html
or http://www.viemu.com/a_vi_vim_graphical_cheat_sheet_tutorial.html