Howdy there! This is my collection of notes that I have collected over the years as a Sys Admin. I am sharing them here hoping that they will be useful to you. These are concise notes to refresh your mind on how to do certain things, maybe you know what need to be done on one platform but don't know the commands on another. Or maybe just pointers for you to read up the relevan man pages or know what to google for :) They are work in progress, I know I need to polish up my notes so that other can make sense of them. As time permits... - Matteo Marchelli