If you connect linux repo, you can use yum install or yum update to manage your package. On the other hand, if you have RPM package, you can use rpm command to manage packages.
RPM command has been using for installing, uninstalling, upgrading, listing,querying and checking RPM packages on linux system. You can use rpm command with root user.
Frequently Used RPM Commands
Install RPM Package
[root #] rpm -ivh postgresql-libs-8.4.20-1.el6_5.x86_64.rpm
Update RPM Package
[root #] rpm -Uvh postgresql-libs-8.4.20-1.el6_5.x86_64.rpm
List All Installed Packages
[root #] rpm -qa
Search From Installed Packages
[root #] rpm -qa | grep postgresql-libs
Take Information From Installed Package
[root #] rpm -qi postgresql-libs
Uninstall RPM Package
[root #] rpm -ev postgresql-libs