How to retrigger 'autocmd' ?

Hi,

When I 'vimgrep' on a large file tree, I usually turn of 'autocmd' by
':noau vimgrep /xxx/ **/*.c'. Then I got c file open in a buffer but
without the syntax highlighting (maybe also other good things). So I
think what I need to do is to retriggle those 'autocmd' that would
been usually executed if I don't do 'noau ...'. Can anyone tell me
how to, if possible?

Thanks in advance.

--
Life is the only flaw in an otherwise perfect nonexistence
    -- Schopenhauer

narke
public key at http://subkeys.pgp.net:11371 (narkewoody@gmail.com)

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