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On Mon, May 02, 2011 at 10:55:23AM +0200, Marco wrote:
> How can I determine the mime type of a file (like the unix
> command “file -i <some_file>”)?
Well, on my Ubuntu system it's this easy:

> function mime_type(a) return io.popen('file -i '..a):read() end

Unfortunately io.popen "is system dependent and is not available on 
all platforms."