linux 中etcmotd文件可以运行shell指令的吗

参阅 $man motd

The contents of /etc/motd are displayed by login(1) after a suc‐

cessful login but just before it executes the login shell.

The abbreviation "motd" stands for "message of the day", and this

file has been traditionally used for exactly that (it requires

much less disk space than mail to all users).

可见，motd并不执行指令只是在shell运行之前将内容显示在终端。

motd经常用于ssh登录后对用户的提醒、显示ASCII Art等

Linux的欢迎语存放在/etc/issue 和 /etc/motd两个文本文件当中。

/etc/issue存放的是linux登录前的提示语；

/etc/motd存放的是linux登录后的提示语。

直接使用文本编辑器修改即可

用法示例：

$ sudo nano /etc/motd

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