LuaLogging
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http://www.keplerproject.org/lualogging/

LuaLogging provides a simple API to use logging features in Lua.
Its design was based on log4j. LuaLogging currently supports,
through the use of appenders, console, file, email, socket and sql outputs.

Current version is 1.1.4. It was developed for Lua 5.1.

LuaLogging is free software and uses the same license as Lua 5.1. It is part of the Kepler Project. 

To install LuaLogging, copy the "logging" directory to your package.path

Please see docs at http://www.keplerproject.org/lualogging for more details