lua - changing LUA_PATH in torch -

i have 2 lua programs main.lua, module.lua in directory /home/user/lua. want run main.lua while in different directory: /home/user. add following in lua_path

export lua_path=$lua_path:/home/user/lua/?.lua 

when :

/home/user$ th /home/user/lua/main.lua 

i error module.lua not found.

how can fix this?