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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.
The most common method of assigning numbers to lines is to assign every line a unique number, starting at 1 for the first line, and incrementing by 1 for each successive line. In the C programming language the line number of a source code line is one greater than the number of new-line characters read or introduced up to that point.
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.
There could be any number of spaces or tabs either before or after interpreter. The optional-arg will include any extra spaces up to the end-of-line. In Linux, the file specified by interpreter can be executed if it has the execute rights and is one of the following: a native executable, such as an ELF binary
Concatenates and prints files in reverse order line by line tail: Outputs the last part of files tr: Translates or deletes characters tsort: Performs a topological sort: unexpand: Converts spaces to tabs uniq: Removes duplicate lines from a sorted file wc: Prints the number of bytes, words, and lines in files
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 ...
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 ...
{tagfile} – The name of the file where {tagname} is defined, relative to the current directory {tagaddress} – An ex mode command that will take the editor to the location of the tag. For POSIX implementations of vi this may only be a search or a line number, providing added security against arbitrary command execution.