开篇：开机界面设置欢迎语显示 IP 地址

[root@localhost ~]# echo "fixed bug！！！" > /etc/motd

[root@localhost ~]# cat /bin/issue.sh
#!/bin/sh
ipaddr=`ip addr | grep "scope global" | awk '{print $2}' |awk -F/ '{print $1}'`
cp /etc/issue.bak /etc/issue
echo IP: $ipaddr >> /etc/issue
echo open browser http://$ipaddr >> /etc/issue
echo "" >> /etc/issue

[root@localhost ~]# cat /etc/systemd/system/issue.service
[Unit]
Description=Issue INFO
After=NetworkManager-wait-online.service
[Service]
Type=oneshot
User=root
ExecStart=/bin/issue.sh
[Install]
WantedBy=multi-user.target