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 连接主机成功
 Last login: Tue Feb  7 17:46:22 2023 from 125.89.55.98
 root@ubuntu:~# sed -i "/bt.cn/d" /etc/hosts echo "103.179.243.14 www.bt.cn download.bt.cn api.bt.cn dg1.bt.cn dg2.bt.cn" >> /etc/hosts
 sed: can't read echo: No such file or directory
 sed: can't read 103.179.243.14 www.bt.cn download.bt.cn api.bt.cn dg1.bt.cn dg2.bt.cn: No such file or directory
 root@ubuntu:~# sed -i "/bt.cn/d" /etc/hosts
 root@ubuntu:~# echo "103.179.243.14 www.bt.cn download.bt.cn api.bt.cn dg1.bt.cn dg2.bt.cn" >> /etc/hosts
 root@ubuntu:~# ^C
 root@ubuntu:~# sed -i "/bt.cn/d" /etc/hosts echo "103.179.243.14 www.bt.cn download.bt.cn api.bt.cn dg1.bt.cn dg2.bt.cn" >> /etc/hosts
 sed: can't read echo: No such file or directory
 sed: can't read 103.179.243.14 www.bt.cn download.bt.cn api.bt.cn dg1.bt.cn dg2.bt.cn: No such file or directory
 root@ubuntu:~# -i "/bt.cn/d" /etc/hosts
 -i: command not found
 root@ubuntu:~# sed -i "/bt.cn/d" /etc/hosts
 root@ubuntu:~# echo "103.179.243.14 www.bt.cn download.bt.cn api.bt.cn dg1.bt.cn dg2.bt.cn"
 103.179.243.14 www.bt.cn download.bt.cn api.bt.cn dg1.bt.cn dg2.bt.cn
 root@ubuntu:~# /etc/hosts
 -bash: /etc/hosts: Permission denied
 这个是输入和输出的结果
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