#  rpm -qa |grep yum-utils
# yum -y install yum-utils*
# rpm -ql yum-utils
/usr/bin/debuginfo-install
/usr/bin/package-cleanup
/usr/bin/repo-graph
/usr/bin/repo-rss
/usr/bin/repoclosure
/usr/bin/repodiff
/usr/bin/repomanage
/usr/bin/repoquery
/usr/bin/reposync
/usr/bin/repotrack
/usr/bin/verifytree
/usr/bin/yum-builddep
/usr/bin/yum-debug-dump
/usr/bin/yum-groups-manager
/usr/bin/yumdownloader       #可以看到yumdownloade这个工具是由yum-utils这个软件安装生成的！