The ability to 'multitask,' to switch rapidly among many competing focuses of attention, has become the hallmark of a successful citizen of the 21st century.
UNIX always presumes you know what you're doing. You're the human being, after all, and it is a mere operating system.
I came of technical age with UNIX, where I learned with power-greedy pleasure that you could kill a system right out from under yourself with a single command.
I like the little semi-competencies of human beings, I realize. Governance, after all, is a messy business, a world of demi-solutions and compromise, where ideals are tarnished regularly.
Each new tool we create ends an old relationship with the world and starts a new one. And we're changed by that relationship, inevitably. It changes the way we live, changes our patterns, changes our social organization.
Reading code is like reading all things written: You have to scribble, make a mess, remind yourself that the work comes to you through trial and error and revision.