gistfile1.rb

#!/usr/bin/ruby
require 'rubygems'
require 'erubis'

input = "
<% @conf.each do |k, v| -%>
<%= k %>=<%= v %>
<% end -%>
"

eruby = Erubis::Eruby.new(input)

postfix = Hash.new
postfix["multi"] = {
         "postfix"   =>   {
                            "bind_address" => "127.0.0.1",
                            "deadbeats_concurancy_limit" => "20",
                            "hash_queue_depth" => 3,
                            "in_flow_delay" => "5s"
                          },
         "sysmail"   =>   {
                            "bind_address" => "127.0.0.1",
                            "deadbeats_concurancy_limit" => "20",
                            "hash_queue_depth" => 3,
                            "in_flow_delay" => "5s"
                          }
    }


puts "---------- script source ---"
puts eruby.src    

postconf = Hash.new

postfix["multi"].each do |k, v|
    postconf = postfix["multi"][k]

    puts "postconf is a #{postconf.class}"
    puts "---------- result ----------"
    puts eruby.evaluate( :conf => postconf )
    postconf.clear
end