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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 ...
The name vi comes from the abbreviated ex command (vi) to enter the visual mode from within it. The longform command to do the same was visual, [13] [14] and the name vi is explained as a contraction of visual in later literature. vi is also the shell command to launch ex/vi in the visual mode directly, from within a shell. [13]
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.
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
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 ...
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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The number of lines printed may be changed with a command line option. The following example shows the first 20 lines of filename: head -n 20 filename. This displays the first 5 lines of all files starting with foo: head -n 5 foo* Most versions [citation needed] allow omitting n and instead directly specifying the number: -5.