Exemplo de busca e leitura de arquivos xml

untitled.rb

#!/usr/bin/env ruby 
require 'rubygems'
require 'nokogiri'
require 'find'

FIND_PATH = "/Users/warlley/Downloads/nfe"

Find.find(FIND_PATH) do |file_path|
  if File.extname(file_path).downcase == '.xml'      
    nfe = Nokogiri::XML(File.open(file_path))
      
    puts "Data emissao: #{nfe.search('infNFe/ide/dEmi').text}"
    puts "Numero NF: #{nfe.search('infNFe/ide/nNF').text}"
    puts "CNPJ: #{nfe.search('infNFe/emit/CNPJ').text}"
    puts "Chave: #{nfe.search('infNFe').first['Id'].upcase.gsub('NFE', '')}"
    puts "Versao: #{nfe.search('infNFe').first['versao']}"
    puts "============="
  end
end