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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 core ex commands which relate to search and replace are essential to vi. For instance, the ex command : %s /XXX/ YYY/ g replaces every instance of XXX with YYY, and works in vi too. The % means every line in the file. The 'g' stands for global and means replace every instance on every line (if it was not specified, then only the first ...
Command-line or Cmdline mode – provides a single line input at the bottom of the Vim window. Commands (beginning with :) and some other keys for specific actions (including pattern search and the filter command) activate this mode. On completion of the command, Vim returns to the previous mode. [38] [33]: 12
A "manual" way of editing in an external GUI text editor is to use copy and paste.Some text editors do not support, or may not be set up to support, various special characters—Chinese characters, non-Latin letters, mathematical symbols, and so on—they are typically replaced with a character that renders as a square.
All commands may be prefixed by a line number to operate on that line. In the line ,l, the lowercase L stands for the list command. The command is prefixed by a range, in this case , which is a shortcut for 1,$. A range is two line numbers separated by a comma ($ means the last line). In return, ed lists all lines, from first to last.
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In computing, a line number is a method used to specify a particular sequence of characters in a text file.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.
less can be invoked with options to change its behaviour, for example, the number of lines to display on the screen. A few options vary depending on the operating system. While less is displaying the file, various commands can be used to navigate through the file. These commands are based on those used by both more and vi. It is also possible ...