# autocmd
[toc]
## usage使用

:::success
:au[tocmd] [group] {event} {aupat} [++once] [++nested] {cmd}

Add {cmd} to the list of commands that Vim will
execute automatically on {event} for a file matching {aupat} autocmd-pattern.
A quote character is seen as argument to the :autocmd and won't start a comment.
Nvim always adds {cmd} after existing autocommands so they execute in the order in which they were defined.See autocmd-nested for [++nested].
autocmd-once
If [++once] is supplied the command is executed once, then removed ("one shot").

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### augroup
:::success
augroup vimrc
" Remove all vimrc autocommands
autocmd!
au BufNewFile,BufRead *.html so <sfile>:h/html.vim
augroup END
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### usage
:::success
:au[tocmd]! [group] {event} {aupat} [++once] [++nested] {cmd}

    Remove all autocommands associated with {event} and
    {aupat}, and add the command {cmd}.
    See autocmd-once for [++once].
    See autocmd-nested for [++nested].

:au[tocmd]! [group] {event} {aupat}

    {aupat}.
:au[tocmd]! [group] * {aupat}  #Remove all autocommands associated with {aupat} for all events.
:au[tocmd]! [group] {event} # Remove ALL autocommands for {event}. You should not do this without a group for
    BufRead and other common events, it can break
    plugins, syntax highlighting, etc.
:au[tocmd]! [group]	Remove ALL autocommands.
    a quote will be seen as argument to the :autocmd
    and won't start a comment.
    Warning: You should normally not do this without a group, it breaks plugins, syntax highlighting, etc.
When the [group] argument is not given, Vim uses the current group (as defined
with ":augroup"); otherwise, Vim uses the group defined with [group].
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