Yum command

yum search any-package
yum search httpd
yum info httpd
yum install any-package
yum install gkrellm
yum remove any-package
yum remove gkrellm
available yum list | less
yum list installed | less
yum list updates | less
yum clean all ( removes from /var/cache/yum )
yum groupinstall "groupname"