方法一:[root@hgg ~]# vi /etc/motd
方法二:echo "哈哈哈" >> /etc/motd
作用:可以对操作系统的用户进行注意事项说明
/etc/issue==/etc/issue.net
方法一:echo "" > /etc/issue
方法二: > /etc/issue
方法一:[root@hgg ~]# echo "Welcome to hgg" > /etc/issue
方法二: vi /etc/issue