Red Hat’s Package Manager (RPM)
RPM is a powerful software manager. It can install, remove, query, and verify the software on your system. Rpm is more than a Red Hat specific tool. Many other modern distributions, such as Caldera and SuSe, use rpm too.
Querying Your System
The first thing you should do is look and see what software you have installed on your system. Here is the command to use:
rpm -qa | more