在 Mac 上使用 SSH 连接远程服务器,运行 mongo 会出现报错:

Failed global initialization: BadValue Invalid or no user locale set. Please ensure LANG and/or LC_* environment variables are set correctly.

运行 mysql、psql 或者其他一些程序也可能出现如下警告:

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

这是因为 Mac OS X 使用 SSH 连接远程服务器的时候缺少两个变量,解决办法是在 Mac OS X 本机的 ~/.bash_profit 文件中添加下面两行代码:

export LC_CTYPE=en_US.UTF-8
export LC_ALL=en_US.UTF-8

重启终端(Terminal)后可以解决该问题。