# File lib/automateit/package_manager/dpkg.rb, line 9
  def installed?(*packages)
    return _installed_helper?(*packages) do |list, opts|
      ### data = `dpkg --status nomarch apache2 not_a_real_package 2>&1`
      cmd = "dpkg --status "+list.join(" ")+" 2>&1"

      log.debug(PEXEC+cmd)
      data = `#{cmd}`
      matches = data.scan(/^Package: (.+)$\s*^Status: (.+)$/)
      available = matches.inject([]) do |sum, match|
        package, status = match
        sum << package if status.match(/(?:^|\s)installed\b/)
        sum
      end

      available
    end
  end