wget
wget -r -np -nH -e robots=off -w 1 http://mirrors.ustc.edu.cn/centos/7/os/x86_64/ &
wget -r -np -nH -e robots=off -w 1 http://mirrors.ustc.edu.cn/alpine/v3.15/main/x86_64/ &
wget -r -np -nH -e robots=off -w 1 http://mirrors.ustc.edu.cn/centos/7/os/x86_64/ &
wget -r -np -nH -e robots=off -w 1 http://mirrors.ustc.edu.cn/alpine/v3.15/main/x86_64/ &