Vim

Variables

In order to see variables you can simply use :let <variable> or without a variable to see all the variables defined.

Variables have also scope (see :help internal-variables)

Prefix	Description
`g:`	global variables
`b:`	local buffer variables
`w:`	local window variables
`t:`	local tab page variables
`s:`	script-local variables
`l:`	local function variables
`v:`	Vim variables
`a:`	function argument

How to view variables in Vim

Predefined variables

Environment

Command	Description
`:abbreviate`	list abbreviations
`:args`	argument list
`:augroup`	augroups
`:autocmd`	list auto-commands
`:buffers`	list buffers
`:breaklist`	list current breakpoints
`:cabbrev`	list command mode abbreviations
`:changes`	changes
`:cmap`	list command mode maps
`:command`	list commands
`:compiler`	list compiler scripts
`:digraphs`	digraphs
`:file`	print filename, cursor position and status (like Ctrl-G)
`:filetype`	on/off settings for filetype detect/plugins/indent
`:function`	list user-defined functions (names and argument lists but not the full code)
`:function Foo`	user-defined function Foo() (full code list)
`:highlight`	highlight groups
`:history c`	command history
`:history =`	expression history
`:history s`	search history
`:history`	your commands
`:iabbrev`	list insert mode abbreviations
`:imap`	list insert mode maps
`:intro`	the Vim splash screen, with summary version info
`:jumps`	your movements
`:language`	current language settings
`:let`	all variables
`:let FooBar`	variable FooBar
`:let g:`	global variables
`:let v:`	Vim variables
`:list`	buffer lines (many similar commands)
`:lmap`	language mappings (set by keymap or by lmap)
`:ls`	buffers
`:ls!`	buffers, including "unlisted" buffers
`:map!`	Insert and Command-line mode maps (imap, cmap)
`:map`	Normal and Visual mode maps (nmap, vmap, xmap, smap, omap)
`:map<buffer>`	buffer local Normal and Visual mode maps
`:map!<buffer>`	buffer local Insert and Command-line mode maps
`:marks`	marks
`:menu`	menu items
`:messages`	message history
`:nmap`	Normal-mode mappings only
`:omap`	Operator-pending mode mappings only
`:print`	display buffer lines (useful after :g or with a range)
`:reg`	registers
`:scriptnames`	all scripts sourced so far
`:set all`	all options, including defaults
`:setglobal`	global option values
`:setlocal`	local option values
`:set`	options with non-default value
`:set termcap`	list terminal codes and terminal keys
`:smap`	Select-mode mappings only
`:spellinfo`	spellfiles used
`:syntax`	syntax items
`:syn sync`	current syntax sync mode
`:tabs`	tab pages
`:tags`	tag stack contents
`:undolist`	leaves of the undo tree
`:verbose`	show info about where a map or autocmd or function is defined
`:version`	list version and build options
`:vmap`	Visual and Select mode mappings only
`:winpos`	Vim window position (gui)
`:xmap`	visual mode maps only

Registers

There are ten types of registers (see :help registers):

The unnamed register ""
10 numbered registers "0 to "9
The small delete register "-
26 named registers "a to "z or "A to "Z
Three read-only registers ": (most recent executed command line), ". (last inserted text) and "% (relative file path)
Alternate buffer register "#
The expression register "=
The selection and drop registers "*, "+ and "~
The black hole register "_
Last search pattern register "/

Commands

Command	Description	Binding
`:argdo`	execute action on each file passed as argument when `vim` was started
`:bufdo`	execute action on each buffer
`:diffthis`	make the current window part of the diff window
`:echom[sg]`	print message
`:exe[cute]`	execute command passed as string
`:mks`	save session to disk
`:norm[al]`	run command in normal mode
`:r[ead] !{cmd}`	execute `{cmd}` and insert the standard output
`:scrollbind`	Binds two or more windows to scroll together
`:vsplit`	split vertically	Ctrl-w v
`:windo`	execute action on the visible buffers opened

Quickfix and location list

https://freshman.tech/vim-quickfix-and-location-list/

Substitutions

Use && to repeat the last substitution.

http://vimregex.com/

Scripting

https://devhints.io/vimscript

Normal mode

g Ctrl-g: give information about selected text
gi return in insert mode in the last place you exited it
gv reselect the last selection
g; go to older position in the changelist
g, go to newer position in the changelist
Ctrl-e: move viewport one line up
Ctrl-y: move viewport one line down

Shortcut	Description
`Ctrl-u`	move a page up
`Ctrl-d`	move a page down
`zz`	move the current line at the center

Window

Shortcut	Description
`Ctrl-w + K`	change vertical split to horizontal
`Ctrl-w + H`	change horizontal split to vertical

Insert mode

Ctrl-r %: relative path of the current file
Ctrl-t: indent current line
Ctrl-d: backdent current line

Cookbook

Multiline editing

It's not immediate like other editors but it's possible, the best option is to use a plugin like vim-multiple-cursors.

Append text

This works out of the box in vim: with Visual block mode select the lines you want to append text to, press $ to move the cursor at the end of line and then press A to start append mode. After you terminated to insert the text, ESC and wait the text to update.

Edit multiple files at once

Effective editing of multiple files in Vim

Plugins

ALE Asynchronous Lint Engine is a plugin providing linting (syntax checking and semantic errors)