Vim

q: (query history cmd)
: C-f (query history cmd)

@: (repeat last cmd)

--move screen
C-y (move the screen up)
C-e (move the screen down)
zz (center the current line)

source ~/.vim/vimrc (reload vimrc)

hex display mode
------------------
:%!xxd (go into hex display mode)
:%!xxd -r (exit hex display mode)

-----------------
edit(i I  s S  a A  o O  r R  C-w C-u)
select(v V C-v) -> copy(y) | paste(p) | delete(x d) | edit(c I A)
-----------------
[number] operator(x X  d dd D  y yy Y  c  v V C-v) 
[number] motion(h   j   k  l   0 ^ $  b B  w W  e E  t T  f F  gg G  i* a*  C-u C-d C-f C-b)
-----------------

--bookmark
m{a-zA-Z`'} (lowercase in a single file, UPPERCASE across files)
`{a-zA-Z`'} '{a-zA-Z} (go to bookmark)

--fold
set foldenable (C-z)
set foldmethod=indent
za (fold/unfold current)
zr/zR (unfold one/all level in current file)
zm/zM (fold one/all level in current file)

--session
:mks/mksession filename
:so/source filename

--buffer(:help files)
:ls :files :buffers

:b/buffer blur_buffer_name
:b/buffer buffer_num
bufferb_num C-^
C-^(between top two buffers)
:e #(between top two buffers)

--indent
:set autoindent
:set smartindent
:set cindent

:set tabstop=width(define tab width)
:set softtabstop=width('tab' key width)
:set shiftwidth=width(auto indent width)

:set expandtab
:set noexpandtab
:retab!(whole file)

<< #<< #1,#2<<
>> #>> #1,#2>>
v< v#<
v> v#>
v=(auto indent selected lines)

--line
#G #gg :#
C-g (current line info)
:set nu/number
:set ruler

--edit
u C-r
U(recover current line)
J(join next line with a space)

C-P (auto-complete)
C-N (previous selection)

:set nocp (not compatible with VI)
Tab C-d (list candidates)

% (find bracket)
. (repeat)

--file
:q
:qa (quit all)
:wq, ZZ
:q!, ZQ

:!cmd

:w filename
:#1,#2 w filename
v :w filename(unit:line)

:r filename(paste content at below)
:r !cmd

:e filename
:e folder
:e!(revert file)
:e #(go to last buffer)

--search
/pattern[\c][\C] 
?pattern[\c][\C]
* (search current word forward)
# (search current word backward)
\c (ignore case)
\C (case sensitive)

search whole word:
/\v
/\

:set ic/ignorecase
:set hls/hlsearch
:set is/incsearch
:set wrapscan

--replace
:s/old/new (first occurence)
:s/old/new/g (entire line)
:s/old/new/gc (entire line with confirmation)
:#1,#2s/old/new/g (from line #1 to line #2)
:#1,$s/old/new/g (from line #1 to the last line)
:%s/old/new/g (whole file)

--jumps
:jumps
C-o(older)
C-i(newer)
`` (jump between last two)

--window
:new :vnew :sp :vsp :tabnew [filename]
:close :tabclose C-wq(close window)

C-w +/-/_/=  C-w[#]-  C-w[#]+ (change window size)
C-w w/p/h/l/j/k(move cursor between windows)
C-w H/L/J/K (move window)

gt :tabn (goto tab)
#gt (goto #st tab)
gT :tabp (goto previous tab)

:pwd 
:cd

--reg
:register/reg (show)
:let @reg='val' (set)
C-r reg (edit mode)
"reg (selection mode)

--copy & paste
"*y  "*yy  "*dd (copy to clipboard)
"*p  "*P  C-r* [at insert mode] (paste from clipboard)
:#y (copy line #)
:#,#y (copy from line # to line #)

--settings
:set key (set or get value)
:set nokey
:set key! (not)
:set key& (set to default)
:set key? (get value)
:set key* (dialog)

--encoding
:set enc/encoding=utf8
:set fenc/fileencoding
:set fencs/fileencodings
:set bomb/nobomb (unicode BOM)

--blur open
:find **/rebar.cm*
:echo globpath('.', '**/rebar*')

--vimgrep (:help vimgrep)
:[#]vim/vimgrep /pattern[\c][\C]/[g][j] **/*.erl
#(only search for the first # matches)
\c(ignore case)
\C(case sensitive)
\g(every match is added, otherwise matched same line only added once)
\j(no jump to the first match, other will jump to the first match)

:copen (open quickfix list)
:cclose (close quickfix list)
:cc (go to current match)
:cn (go to next match)
:cp (go to previous match)

--syntax highlight
:syntax enable/on/off
:set bg/background=dark
:set bg/background=light

--window size
:set lines=# columns=#(set window width and height)
Alt (wait)  x (maximize window at Windows)

--file type/format
:set filetype=cpp/erlang (list in /syntax folder)
:set fileformat=unix

--help
:h :help F1 [sth]

--line wrap
:set wrap/nowrap

--backspace
:set backspace=0/1/2 (0/1 - delete just inputed, 2 - delete any characters)

--conf files
vimrc (run config)
viminfo (edit history)
.filename.swp (file backup while editing)
filename~ (file backup when saving, [:set backup/nobackup]) 

--key map
map/nmap/vmap/imap  ^x (map=nmap+vmap)

--paste from outside
:set paste (enter into paste mode)
:set nopaste (exit paster mode)

--uppercase lowercase transform
gu: transform selected to lowercase
gU: transform selected to uppercase
guu: transform current row to lowercase
gUU: transform current row to uppercase

--set file enryption key (set to empty to clear existing key)
:X (:set key=)

--record macro
qa (start recording, a is the registry name, can be b/c/d...)
... (actions)
q (finish recording)
@a (replay record, a is the registry name)