yum update
yum -y install wget
yum -y update wget
yum -y remove wget
yum grouplist
yum -y groupinstall Desktop
yum -y groupupdate Desktop
yum -y groupremove Desktop
yum clean all
yum -y search wget
yum info wget
yum deplist wget
yum list yum\*
yum list extras
$releasever的值,這個表示當前系統的發行版本,能夠經過rpm -qi centos-release命令查看
其中的Version:7 就是咱們系統的版本號centos
$basearch是咱們的系統硬件架構(CPU指令集),使用命令arch獲得緩存