Yum配置文件位于/etc/yum.conf和/etc/yum.repos.d/CentOS-Base.repo目录下
使用yum时注意：必须使用root身份来执行yum；yum配置文件内的镜像站点必须能与自己进行网络连接；镜像站点越近，带宽越大越好，方便下载。
[root@localhost ~]# yum [options] COMMAND 软件
List of Commands：
install：Install a package or packages on your system
update：Update a package or packages on your system
remove：移出某个软件，后跟软件名称
search：Search package details for the given string 搜索某个软件或重要关键字
list：List a package or groups of packages列出yum所管理的软件名称与版本，www.linuxidc.com类似于rpm –qa
info：Display details about a package or group of packages，类似于rpm –qai
clean：Remove cached data 下载文件被放置在/var/cache/yum中，可以使用clean清除。
check-update：Check for available package updates
Groupinfo：Display details about a package group
groupinstall Install the packages in a group on your system
grouplist：List available package groups
groupremove：Remove the packages in a group from your system
groupupdate：升级整个软件群组
help：Display a helpful usage message
Deplist：List a package's dependencies 列出软件包的依赖关系，在使用本地源软件包进行安装时，可以查看依赖关系
Downgrade：downgrade a package
Erase：Remove a package or packages from your system
localinstall：Install a local RPM安装本地的rpm软件包
makecache：Generate the metadata cache 生成数据缓存
provides：Find what package provides the given value 找到包提供的给定值
reinstall：reinstall a package 重装软件包
repolist：Display the configured software repositories
resolvedep：Determine which package provides the given dependency
shell：Run an interactive yum shell
upgrade：Update packages taking obsoletes into account
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