Tribut to Dag Nanni for this excellent HOWTO
http://xmodulo.com/use-kvm-command-line-debian-ubuntu.html

The virtual machine desktop management tool

virt-manager -c qemu:///system

List domains

virsh --connect qemu:///system list

$ diff -a -y -W 190 file-1 file-2 | less

General

$ lsb_release -a

$ dmesg | head -1

$ cat /proc/versionnote

RedHat

$ cat /etc/redhat-release

SuSE

$ cat /etc/SuSE-release