# File lib/simp/cli/config/items/data/simp_options_ntp_servers.rb, line 28
    def os_value( file='/etc/ntp/ntpservers' )
      # TODO: make this a custom fact?
      # TODO: is /etc/ntp/ntpservers being used in recent versions of SIMP?
      servers = []
      if File.readable? file
        File.readlines( file ).map do |line|
          line.strip!
          if line !~ /^#/
            servers << line
          else
            nil
          end
        end.compact
      end
      servers
    end