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I don't think it's unsafe. The point is that it's only compatible with windows
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It's as unsafe as running external programs can be - if someone puts a malicious cls.exe with your app, your app will run that instead of the system cmd.
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Hmm, maybe you could try some sort of "curses" like thing for windows.
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Actually that's the primary mode of distribution for Lua. It even has a plugins system that way, I believe it is called LuaRocks; you can download and install various packages for quite a lot of functionality - sockets, db access, xml parsing...