yum updaterpm -qa | grep package_name: Search if the package_name is installed
rpm -qc package name: List all package_name configuration files in the system
yum list package_name: List installed and available package_name
yum list installed: List all installed packages in your system
yum grouplist: List all package groups
yum info package_name: Display information about package_name
yum install package_nameyum groupinstall group_nameyum remove package_nameyum groupremove group_name# yum history: display a list of twenty most recent transactions
# yum history info id: examine a particular transaction in more detail
# yum history info idx..idy: examine a particular range of transaction in more detail
# yum history undo id: revert a transaction -> Installed packages will be uninstalled and vice-versa
# yum history redo id: repeat the steps performed in the transaction
# yum-complete-transaction: searches for incomplete or aborted yum transactions on a system and attempts to complete them#
# yum-complete-transaction --cleanup-only: cleans transaction journal files without attempting to resume the aborted transactions