title: List of Lua commands/statements to watch out?
body: <p>I'm making a moddable game and thinking about using Lua as the language for my players to write their own scripts.</p>
  <p>But like any programming language, Lua bound to have some &quot;loopholes&quot; for not-so-nice users to do bad things.</p>
  <p>I'm new to Lua, so I don't really know what Lua &quot;can&quot; do.</p>
  <p>I did a little reasearch online and found that <code>Metatable</code> and <code>ob.exit</code> could be used for doing bad things, is there any other things?</p>
  <p>Could somebody please be so kind and give me a list of the things I should watch out and block it (maybe by replacing it with empty string)?</p>
  <p>Much appreciated!</p>