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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.
Vim (/ v ɪ m / ⓘ; [5] vi improved) is a free and open-source, screen-based text editor program. It is an improved clone of Bill Joy's vi.Vim's author, Bram Moolenaar, derived Vim from a port of the Stevie editor for Amiga [6] and released a version to the public in 1991.
ex was eventually given a full-screen visual interface (adding to its command line oriented operation), thereby becoming the vi text editor. In recent times, ex is implemented as a personality of the vi program; most variants of vi still have an "ex mode ", which is invoked using the command ex , or from within vi for one command by typing the ...
In his 2008 review of the 7th edition for Dr. Dobb's Journal, author Mike Riley compared the coverage afforded by the book to a combination of the Vim online documentation and O'Reilly's vi Editor Pocket Reference. While noting that the book "continues to fulfill an apparent market need," he did not find the book appropriate for more advanced ...
The C language defines whitespace characters to be "space, horizontal tab, new-line, vertical tab, and form-feed". [29] The HTTP network protocol requires different types of whitespace to be used in different parts of the protocol, such as: only the space character in the status line, CRLF at the end of a line, and "linear whitespace" in header ...
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.
uniq is a utility command on Unix, Plan 9, Inferno, and Unix-like operating systems which, when fed a text file or standard input, outputs the text with adjacent identical lines collapsed to one, unique line of text.
It later became the basis for Vim, which was released in 1988. [3] [4] Thompson posted his original C source code as free software to the comp.sys.atari.st newsgroup on 28 June 1987. [5] [6] Tony Andrews added features and ported it to Unix, OS/2 and Amiga, posting his version to the comp.sources.unix newsgroup as free software on 6 June 1988.