a library for retrieving facts from operating systems.A cross-platform Ruby library for retrieving facts from operating systems. Supports multiple resolution mechanisms, any of which can be restricted to working only on certain operating systems or environments. Facter is especially useful for retrieving things like operating system names, IP addresses, MAC addresses, and SSH keys.
It is easy to extend Facter to include your own custom facts or to include additional mechanisms for retrieving facts.
Install facter in Ubuntu
sudo apt-get install facter
This will complete the installation.
If you want to view your system facts just type the following command from your terminal
Output looks like below