​​repo国内源​​ 

> –http://mirrors.aliyun.com
  > –centos-->help
  > -before:yum install wget

​​repo本地目录源​​ 

–mount /dev/cdrom /mnt

–vi /etc/yum.repos.d/local.repo

–[local]

–baseurl=file:///mnt

–gpgcheck=0

–enable=1

​​yum命令​​ 

–yum repolist
–yum clean all
–yum makecache
–yum update

​​yum查询​​ 

–yum list
–yum search
–yum info

​​yum安装&卸载​​ 

–yum install 
–remove|erase

​​yum分组​​ 

–yum grouplist
–yum groupinfo
–yum groupinstall
–yum groupremove
–yum groupupdate

中文显示，查看中文文档

•yum 的 repo 变成aliyun || 本地DVD

•yum grouplist

•yum groupinstall "Chinese Support"

•echo $LANG

–en_US.UTF-8

–LANG=zh_CN.UTF-8

–

•增加epel的repo：

–http://mirrors.aliyun.com

–epel>>>>>help

–wget centos6.......

–

•yum clean all

•yum makecache

•yum search man-pages

•yum install man man-pages man-pages-zh-CN

•【【【【 man bash