I particularly like using strace/dtrace/dtruss to show the communications between the user process and the kernel. You can learn some very interesting system ca

I particularly like using strace/dtrace/dtruss to show the communications between the user process and the kernel. You can learn some very interesting system calls like that, and see how experienced programmers use them. There's another tool of that variety: ltrace shows calls to functions in dynamically-loaded libraries. It... works, mostly, but it doesn't know things like function type signatures, so it has to guess, and sometimes gets it wrong in weird ways. It also doesn't know defines and enums, so it can't turn numbers back into symbolic constants like strace and its close kin can: https://en.wikipedia.org/wiki/Ltrace https://en.wikipedia.org/wiki/Ltrace