autcommand problem.

why doesn't the following auto command work. If i run the same command manually it works.

au BufWritePost *.[ch]
\ if (&filetype == 'c' || &filetype == 'h')
\ | silent call GenerategtagsFiles()
\ | silent execute redraw!


command! GenerategtagsFiles call GenerategtagsFiles()
function! GenerategtagsFiles()
silent exectue '!global --single-update '. bufname("%")

endfunction

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