摘要：
先安装nginx的yum源 http://nginx.org/en/linux_packages.html#stable 找到链接，安装： rpm -ivh http://nginx.org/packages/centos/6/noarch/RPMS/nginx-release-centos-6-0 阅读全文
摘要：
查询一个包是否被安装 # rpm -q < rpm package name>列出所有被安装的rpm package # rpm -qae.g. rpm -qa|grep "pcre" 阅读全文