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Am 29.01.2016 um 07:34 schröbte Dirk Laurie:
I'm developing a Lua program under Linux that may in some
not totally unforeseeable future need to run under Windows.

Do line endings get standardized when Lua reads a text file?

More precisely, in the following code snippet, will "line"
contain "\r" characters?

If your program reads a Windows-formatted text file under Linux, then yes, there will be "\r" characters. The other combinations won't have "\r" characters.

infile ="filename.txt"
source = infile:read"*a"
for line in source:gmatch"[^\n]+" do
    -- whatever