支持yum
yum -y install wget
不支持yum
a.查看当前linux版本
cat /etc/issue && uname -a
b.根据版本下载相应的rpm
https://mirrors.edge.kernel.org/centos/7/os/x86_64/Packages/wget-1.14-15.el7_4.1.x86_64.rpm
c.安装rpm
rpm -ivh wget-1.14-15.el7_4.1.x86_64.rpm
参考网址：
https://www.cnblogs.com/simonbaker/p/5131019.html
https://blog.csdn.net/keda8997110/article/details/8735735