yum

[yum-check]

ls -l /etc/yum.repos.d/

[yum-/var/cache/yum]

yum clean all

[yum-install & remove & search & list & info & search ooxx]
yum install ooxx

yum remove ooxx

yum search ooxx

yum list

yum info ooxx

yum grouplist

yum groupinstall "ooxx"

,etc

rpm -qc yum
/var/log/yum.log