测试25端口是否开放

telnet smtp.aol.com 25

测试IPv4优先还是IPv6优先

curl ip.p3terx.com

一键修改默认SSH端口，自行替换2222

sed -i 's/#Port\ 22/Port\ 2222/' /etc/ssh/sshd_config && systemctl reload ssh

一键清理 /var/log/目录下的过期日志

find /var/log/ -name "*.1" -exec rm -rf {} \; && find /var/log/ -name "*.log.1" -exec rm -rf {} \; && find /var/log/ -name "*.gz" -exec rm -rf {} \;

流媒体检测：

bash <(curl -L -s check.unlock.media)