The purpose of this book is put all what I have learned while working with Linux in one place.

So it is a book primarily targeted for myself.

It started as a couple of pages (in 2004) and got bigger and bigger over the years.

However in a open source world, it is also nice to give something back to others and not always just profit. Therefore I published it in the Internet and make it a bit nicer.

In 2025 I intensively used AI. Instead of finding that this book gets obsolete it grow massively. I remember how inefficient I worked in the past without AI. I do not want to miss AI. AI however knows a lot but is unable to really test and do the work. It also lacks of sitting back an relax and come back with new ideas. So the book now contains also what I learned using AI.

This book has been written using docbook (pure xml). Docbook strictly separates semantics (content meaning) from visual appearance. The docbook file is then converted into a visual presentation using stylesheets. Therefore this section shows what Docbook tags are used, but the outcome, the visual presentations depends on the stylesheet transformations. This means while I'm writing this text I do not know how it will later look like. This text is converted in html as well as pdf and might look therefore different. I use serna-free a WYSIWYG xml editor, so see one possible visual presentation while I'm editing (except when I work in text mode).