This is probably the geekiest book I’ve read in a long time. It’s basically one step up from reading the source code for your favourite operating system. Or perhaps having a favourite operating system.
What I would say is that Unix has been pretty much the only constant throughout my career. I started with Solaris and HP-UX at university. I installed an early version of Linux on my personal machine to avoid the thirty-minute walk from home to the university labs. I’ve done consulting, I’ve developed both vertical and horizontal applications1, C and C++, Swift and Java, banking and telecoms. Pretty much the only thing they’ve all had in common was some sort of Unix underpinning.