Mac iTerm2 login CentOS warning: setlocale: LC_CTYPE: cannot change locale (UTF-8): No such file or directory
报错原因
没有utf-8这个语系（没添加语言_国名前缀），LC_ALL又没设定值。
服务端解决方法
在远程系统上， /etc/environment 加入以下两行，重新登陆即可。
LANG=en_US.utf-8
LC_ALL=en_US.utf-8
Mac端解决方法
编辑.bashrc或者.zshrc文件，添加
export LC_ALL=en_US.UTF-8
export LANG=en_US.UTF-8
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