Example Lua implementation of a “cat” program, for the education of Vultraz.

gistfile1.lua

-- Usage: lua cat.lua file1 file2 file3 ... fileN
-- Writes the concatenation of all the files to the standard output stream.

for _, filename in ipairs(arg) do
	local file, err = io.open(filename, 'rb')
	if file then
		io.write(file:read '*a')
	else
		error(filename .. ": " .. err)
	end
end

@Vultraz: Please do try to understand this rather than just copying it without knowing what it does.

If you would ask “but what do these io functions do?”, read http://www.lua.org/manual/5.2/manual.html#6.8. (I assume you don’t already know how the io library works, given that Wesnoth doesn’t allow its use.)

If you would ask “but where do I get lua for windows?”, try instead searching Google for “windows lua”.