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On Fri, 24 Oct 2008, Jeff Pohlmeyer wrote:

On Linux the, "r") will fail even on an existing
file if you don't have read permissions, and will succeed if
you do, even when the "name" is actually a directory. (Which
might not be what you expect.)

What's more the open/close method can fail on linux even if the file exists, is a regular file, and you have all the required permissions to it: the file can be too large for you to open! You can get around this surprise by compiling your lua with large file support, which it sadly isn't by default on Debian for instance.