configuration yum:
$ cat /etc/yum.conf
list installed (and installed packagename)
$ yum list
$ yum list | grep -i packagename
info packagename
$ yum info packagename
search packagename
$ yum search packagename
dependency list
$ yum deplist packagename
install packagename
$ yum install packagename
update
$ yum update
remove packagename
$ yum remove packagename