>>201
これだとどう？

def do_erb(in_file, out_file, bind)
　open(in_file) do |f|
　　tmplate = ERB.new(f.read)
　　open(out_file, "w") do |dest|
　　　dest.write(tmplate.result(bind))
　　end
　end
end

def make_erb
　text = "Hello, World"
　do_erb "hoge.txt.erb", "hoge.txt", binding
end