Questions

1 ~/.bashrc ~/.profile /etc/bashrc /etc/profile
当通过Xshell连接时（SSH）或 ssh ip 时，会依次执行： 

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### 登陆shell？
# This is /etc/bash.bashrc
# This is /etc/profile
# This is /home/root/.bashrc
# This is /home/root/.profile

当通过 su 切换用户时，会执行：

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# This is /etc/bash.bashrc
# This is /home/guo/.bashrc