perl: warning: Setting locale failed.

錯誤：

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

解決：

export LANG=en_US:zh_CN.UTF-8&&export LC_ALL=C&&perl hello.pl