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Luiz Henrique de Figueiredo wrote:

If I say
     dofile('xxx.lua')
and xxx.lua is not in the current directory, it is an error.

Is there a way of giving Lua a path in which dofile should look
before giving up?


Try require"xxx". Then Lua will search package.path for xxx.lua.
`require' takes exactly one argument (derived from a module name) and returns zero or one values. An arbitrary script on the other hand can take many arguments and return many values. Thus, `require' is not a substitution for running arbitrary scripts.
I personally am happy with a patch [1] to the Lua interpreter, that does exactly that: search for scripts on the so-called "LUA_RPATH". 

[1] http://lua-users.org/lists/lua-l/2006-01/msg00130.html
--
Shmuel