> fnameescape() is for Vim commands. Since "grep" executes an external
> command you need to use shellescape(). And that does handle parens.
>
> :exe '!ls ' . shellescape('asdf(asdf)asdf')
> ls: cannot access asdf(asdf)asdf: No such file or directory
It is incorrect to use shellescape() for :! without the second argument:
exe '!ls' shellescape('%%%')
will show you anything, but not “ls: cannot access %%%: No such file or
directory”.
exe '!ls' shellescape('%%%', 1)
is the correct variant.
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