UUIDtools mac_address is nil on ubuntu

原因看代码：

def self.get_mac_address #:nodoc:
    if @@mac_address.nil?
      if RUBY_PLATFORM =~ /solaris/
        begin
                ifconfig_output = `/sbin/ifconfig -a`
                ip_addresses = ifconfig_output.scan(
                  /inet\s?(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})/)
                ip = ip_addresses.find {|addr| addr[0] != '127.0.0.1'}[0]
                @@mac_address = `/usr/sbin/arp #{ip}`.split(' ')[3]
        rescue Exception
        end
      elsif RUBY_PLATFORM =~ /win/ && !(RUBY_PLATFORM =~ /darwin/)
        begin
          ifconfig_output = `ipconfig /all`
          mac_addresses = ifconfig_output.scan(
            Regexp.new("(#{(["[0-9a-fA-F]{2}"] * 6).join("-")})"))
          if mac_addresses.size > 0
            @@mac_address = mac_addresses.first.first.downcase.gsub(/-/, ":")
          end
        rescue
        end
      else
        begin
          mac_addresses = []
          if RUBY_PLATFORM =~ /netbsd/
            ifconfig_output = `/sbin/ifconfig -a 2>&1`
            mac_addresses = ifconfig_output.scan(
              Regexp.new("address\: (#{(["[0-9a-fA-F]{2}"] * 6).join(":")})"))
          elsif File.exists?('/sbin/ifconfig')
            ifconfig_output = `/sbin/ifconfig 2>&1`
            mac_addresses = ifconfig_output.scan(
              Regexp.new("ether (#{(["[0-9a-fA-F]{2}"] * 6).join(":")})"))
            if mac_addresses.size == 0
              ifconfig_output = `/sbin/ifconfig -a 2>&1`
              mac_addresses = ifconfig_output.scan(
                Regexp.new("ether (#{(["[0-9a-fA-F]{2}"] * 6).join(":")})"))
            end
            if mac_addresses.size == 0
              ifconfig_output =
                `/sbin/ifconfig | grep HWaddr | cut -c39- 2>&1`
              mac_addresses = ifconfig_output.scan(
                Regexp.new("(#{(["[0-9a-fA-F]{2}"] * 6).join(":")})"))
            end
          else
            ifconfig_output =
              `ifconfig 2>&1`
            mac_addresses = ifconfig_output.scan(
              Regexp.new("ether (#{(["[0-9a-fA-F]{2}"] * 6).join(":")})"))
            if mac_addresses.size == 0
              ifconfig_output =
                `ifconfig -a 2>&1`
              mac_addresses = ifconfig_output.scan(
                Regexp.new("ether (#{(["[0-9a-fA-F]{2}"] * 6).join(":")})"))
            end
            if mac_addresses.size == 0
              ifconfig_output =
                `ifconfig | grep HWaddr | cut -c39- 2>&1`
              mac_addresses = ifconfig_output.scan(
                Regexp.new("(#{(["[0-9a-fA-F]{2}"] * 6).join(":")})"))
            end
          end
          if mac_addresses.size > 0
            @@mac_address = mac_addresses.first.first
          end
        rescue
        end
      end
      @@mac_address.downcase! if @@mac_address.respond_to?(:downcase!)
      @@mac_address.strip! if @@mac_address.respond_to?(:strip!)
      # Verify that the MAC address is in the right format.
      # Nil it out if it isn't.
      unless @@mac_address.respond_to?(:scan) &&
          @@mac_address.scan(/#{(["[0-9a-f]{2}"] * 6).join(":")}/)
        @@mac_address = nil
      end
    end
    return @@mac_address
  end

从这个代码上就能看出 mac address 是通过 ifconfig 命令里得到而且还是通过 HWaddr 过滤得到的。
所以控制台显示结果是除英语外的语言就会出这个问题.

解决方案:

sudo vi /etc/bash.bashrc
在最下面添加: 
export LANG=C

相关资料:
http://github.com/sporkmonger/uuidtools/
http://wiki.ubuntu.org.cn/index.php?title=Locale&variant=zh-tw#.E4.B8.83.E3.80.81.E6.80.8E.E6.A0.B7.E8.AE.BE.E5.AE.9Alocale.E5.91.A2.EF.BC.9F