Comment by steakejjs

They are technical.

Brushing up on:

K&R - The C Programming Language

K&P - The Unix Programming Environment

K&P - The Practice of Programming

Kerrisk - The Linux Programming Interface (Not light reading)

Even though it is mostly review, reading code and seeing commands that K&R&P run has actually helped my workflow, code quality, etc.

Highly recommend re-reading if it has been a while. Even things like variable names have noticeably improved since beginning re-reading.

And, the Linux Programming Interface....is huge. There's always more to learn in there.