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Any ideas how to check the existence of a file?
Or better read the object type e.g.:

   0 doesn't exist
   1 is a file
   2 is a directory
   3 is a link (I don't know the exact name of this type)

Independent of the file access attributes!

I feel that very few further functions are needed to make Lua a great
language for file manipulation. Like read/set access rights and read
directory entries.