My book, The newline Guide to Bash Scripting: https://www.newline.co/courses/newline-guide-to-bash-scripting

[ my public key: https://keybase.io/l0b0; my proof: https://keybase.io/l0b0/sigs/-sU_dPlI9HzZthatZd5JCO9gZLIX2_pvhEeNmJDCjLQ ]