perl: warning: Falling back to the standard locale ("C").

perl: warning: Falling back to the standard locale ("C").
perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings:
        LANGUAGE = (unset),
        LC_ALL = (unset),
        LANG = "zh_CN.GB2312;zh_CN.UTF-8;en_US;en_US.UTF-8"
    are supported and installed on your system.
perl: warning: Falling back to the standard locale ("C").

在使用其它的某些命令时(如：mysqlhotcopy)也会也出现类似的提示。
搜索了好一段时间，并试了几次，找到一个解决此问题的简单方法，如下：

vi /root/.bashrc
再最底部加上
export LC_ALL=C
或者直接运行
echo "export LC_ALL=C" >> /root/.bashrc
然后执行一下：
source /root/.bashrc