General
$ lsb_release -a
$ dmesg | head -1
$ cat /proc/versionnote
RedHat
$ cat /etc/redhat-release
SuSE
$ cat /etc/SuSE-release
ANy IT-konsult
My memory extension in the cloud :-)
$ lsb_release -a
$ dmesg | head -1
$ cat /proc/versionnote
$ cat /etc/redhat-release
$ cat /etc/SuSE-release