Linux系统 apt-get 命令的使用：安装、更新、卸载软件包：https://blog.csdn.net/xietansheng/article/details/80044644
1 更新apt-get
1.1 查看所用的源
vim /etc/apt/sources.list
# deb http://snapshot.debian.org/archive/debian/20191224T000000Z stretch main
deb http://deb.debian.org/debian stretch main
# deb http://snapshot.debian.org/archive/debian-security/20191224T000000Z stretch/updates main
deb http://security.debian.org/debian-security stretch/updates main
# deb http://snapshot.debian.org/archive/debian/20191224T000000Z stretch-updates main
deb http://deb.debian.org/debian stretch-updates main
1.2 重命名原来的源作为备份
mv /etc/apt/sources.list /etc/apt/sources.list.bak
1.3 修改为国内源
mv /etc/apt/sources.list /etc/apt/sources.list.bak
echo "deb http://mirrors.163.com/debian/ jessie main non-free contrib" >> /etc/apt/sources.list
echo "deb http://mirrors.163.com/debian/ jessie-proposed-updates main non-free contrib" >>/etc/apt/sources.list
echo "deb-src http://mirrors.163.com/debian/ jessie main non-free contrib" >>/etc/apt/sources.list
echo "deb-src http://mirrors.163.com/debian/ jessie-proposed-updates main non-free contrib" >>/etc/apt/sources.list
deb http://mirrors.163.com/debian/ jessie main non-free contrib
deb http://mirrors.163.com/debian/ jessie-proposed-updates main non-free contrib
deb-src http://mirrors.163.com/debian/ jessie main non-free contrib
deb-src http://mirrors.163.com/debian/ jessie-proposed-updates main non-free contrib
1.4 更新apt软件源
apt-get update
2 下载对应的Xxx即可
apt-get install vim
apt-get install tree
apt-get install yum