list all mapping key binding - Displaying the current Vim environment

list all mapping key binding - Displaying the current Vim environment

You can display the current Vim environment (settings, options, commands, maps, etc) using the following commands:

: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

Notes

Additional information is available to a Vim script. For example, :help tabpagebuflist() shows how to list all buffers in all tabs.

A script called bugreport.vim is provided with Vim. When run, the script produces a file with information about Vim's environment. To see the script, use the command :view $VIMRUNTIME/bugreport.vim in Vim.

Reference:
http://vim.wikia.com/wiki/Displaying_the_current_Vim_environment