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> N.B. I've currently disabled the "lua" button
> since there are security issues with running 
> arbitary Lua scripts on the server obviously. 
> I'm currently looking into ways of dealing 
> with this. I'm not a unix expert so any help 
> and thoughts on the matter gratefully 
> received.

Add a block of code that executes prior to the user's code.  That code
would redefine all functions deemed dangerous (all the file-related
functions) to nil.