VI (for "visual editor") is a text editor for "plain text".
It is the standard-editor on most Unix-systems.
The current versions have almost everything you can expect from an modern editor:
scripting, macro-recording, tags, syntax-coloring, UTF-8, Unicode, GUI etc.
However, the basic concept is quite old, e.g. it also has an ex-mode
that was designed to work with old teletype-devices.
There are several variants:
- BusyBox - includes a tiny vi clone
- nvi - "new vi"
- vile - "VI Like Emacs"
- vim - "VI-Improved" Website: vim.org
- current version: Vim 7.4.507 (2013-07)
- See also Category:Vim Script
Usage: vi file.txt
The bottom screen-row is used as a statusline, and for entering commands.
There is a "normal" mode that acts as command-mode, and an insert-mode:
i - insert text at cursor-position a - append text at end-of-line ESC - abort command, i.e. end insert-mode, and return to normal/commandmode. h j k l - move cursor: left/down/up/right ( use with count: "5k" moves 5 lines up ) The cursor-keys should work as well w b - move cursor one word forward/backward ( "3w" moves 5 words forward ) G - Goto last line ( "33G" goto line 33 ) /abc - find text "abc" n - find next match x - delete character ( use with count: "5x" deletes 5 char ) dd - delete line ( use with count: "2dd" deletes 2 lines ) p P - paste: insert previously deleted text at/before the current position u - undo r R - replace single char / enter Replace-mode (like insert, but overwrites) . - repeat last change-command : is the prefix for commands: :help - show help-pages :set ruler - toggle display of current line-number in status-line :r file2.txt - read: insert contents of file2.txt at current position :33 - move to line 33 :2,5s/old/new/ - substitute: in lines 2..5 replace "old" with "new" :w - write current file ( :w! to force it ) :q - quit ( :q! to force it. Combined: ":wq!" )
( Also, look for "vi reference mug" :)