yum
# yum -y install epel-release
# yum -y install *
# yum -y groupinstall '*'
yum默认下载目录：/var/cache/yum/x86_64/[centos/fedora-version]/[repository]/packages
只下载，不安装：
# yum install --downloadonly --downloaddir=下载路径 *
专门包下载工具：yumdownloader(下载到当前目录，不下载依赖包)
# yum -y install yum-utils
# yumdownloader
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