通常登录修改提示修改两个地方即可，如下：
1、profile /etc/profile或者~/.profile、~/.bashrc (bash shell有效）
2、motd /etc/motd 如下截图是修改了profile做到的 图片：

图片看不到请戳这里

佛祖保佑

profie增加内容如下：

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echo -ne "\033[0;33m"
cat <<EOT
                                  _oo0oo_
                                 088888880
                                 88" . "88
                                 (| -_- |)
                                  0\ = /0
                               ___/'---'\___
                             .' \\\\|     |// '.
                            / \\\\|||  :  |||// \\
                           /_ ||||| -:- |||||- \\
                          |   | \\\\\\  -  /// |   |
                          | \_|  ''\---/''  |_/ |
                          \  .-\__  '-'  __/-.  /
                        ___'. .'  /--.--\  '. .'___
                     ."" '<  '.___\_<|>_/___.' >'  "".
                    | | : '-  \'.;'\ _ /';.'/ - ' : | |
                    \  \ '_.   \_ __\ /__ _/   .-' /  /
                ====='-.____'.___ \_____/___.-'____.-'=====
                                  '=---='
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
                        佛祖保佑    iii    永不死机
EOT
echo -ne "\033[m"

祝你好运