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vi (pronounced as distinct letters, / ˌ v iː ˈ aɪ / ⓘ) [1] is a screen-oriented text editor originally created for the Unix operating system. The portable subset of the behavior of vi and programs based on it, and the ex editor language supported within these programs, is described by (and thus standardized by) the Single Unix Specification and POSIX.
Box-drawing characters, also known as line-drawing characters, are a form of semigraphics widely used in text user interfaces to draw various geometric frames and boxes. These characters are characterized by being designed to be connected horizontally and/or vertically with adjacent characters, which requires proper alignment.
Elvis was the pioneering vi clone, widely admired in the 1990s for its conciseness, and many features. [2] [3] It influenced the development of Vim until about 1997.[4] [5]It was the first to provide color syntax highlighting (and to generalize syntax highlighting to multiple file types), first to provide highlighted selections via keyboard.
The glyphs in Block Elements each share the same character width in most supported fonts, allowing them to be used graphically in row and column arrangements. However, the block does not contain a space character of its own and ASCII space may or may not render at the same width as Block Elements glyphs, as those characters are intended to be ...
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The book features a tarsier on the cover, an image which was also used on the cover of O'Reilly's Unix in a Nutshell and has been incorporated into O'Reilly Media. When questioned about the animal choice, publisher Tim O'Reilly described the tarsier as looking "like somebody who had been a text editor for too long."
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