Linux (UNIX admin and Security nerd.

AIX: 3.2.3e - 6 Solaris 2.3 - 11 SunOS 4.1.2 Linux (original release of) Slackware RHL 5 to Centos 8 Raspbian

Pref: Kbuntu (Desktop) and Alma 8 (server).

Studying for the CISSP.