This is steve-parker.org, the very badly designed internet home of Steve Parker.
I am an IT Consultant, author of the Bourne / Bash shell programming tutorial at https://www.shellscript.sh/ , and of the book Shell Scripting (published in 2011 by Wiley in paper and ebook formats) as well as various other Linux related books (also available in various formats).
I ran SGP IT Consultancy Ltd from 2010-2019. That was at sgpit.com. I don't often visit LinkedIn, but you can find me at https://www.linkedin.com/in/sgparker/ .