Linux更换更新源

Centos 7

# 下载阿里云CentOS 7 repo文件
curl -o /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-7.repo

# 替换文件中的$releasever为7（避免变量解析问题）
sed -i 's/$releasever/7/g' /etc/yum.repos.d/CentOS-Base.repo

yum clean all;yum makecache

Ubuntu

cat > /etc/apt/sources.list <<EOF
deb https://mirrors.ustc.edu.cn/ubuntu/ focal main restricted universe multiverse
deb https://mirrors.ustc.edu.cn/ubuntu/ focal-security main restricted universe multiverse
deb https://mirrors.ustc.edu.cn/ubuntu/ focal-updates main restricted universe multiverse
deb https://mirrors.ustc.edu.cn/ubuntu/ focal-backports main restricted universe multiverse
EOF
sudo apt-get update

Kali Linux

cat > /etc/apt/sources.list <<EOF
deb https://mirrors.ustc.edu.cn/kali kali-rolling main non-free contrib
deb-src https://mirrors.ustc.edu.cn/kali kali-rolling main non-free contrib
EOF
sudo apt-get update