Power User

See into the kernel that everything sits on.

For engineers who debug the hard stuff. Adds the kernel: the user/kernel boundary, virtual memory, the address space, and scheduling.

Lessons in this path

• The Round Trip — Watch one command travel and return.
• The Filesystem Tree — Everything is a file. Walk the tree.
• Reading & Writing — See where text goes when you read and write.
• Permissions — the gate — Watch the kernel check if you're allowed.
• Names vs Things — inodes & links — A filename is a label, not the file.
• From Program to Process — Watch a program on disk come alive in memory.
• The Process Tree — Every process has a parent. Meet PID 1.
• fork() & exec() — See one program become two, then something else.
• Process States — A process is a state machine.
• Signals — Processes talk by sending signals.
• Pipes & Redirection — Wire one program's output into another's input.
• The User/Kernel Boundary — Cross the wall between your code and the kernel.
• Inside the Kernel — Meet the kernel's organs.
• Virtual Memory — Every process thinks it owns all the RAM.
• The Process Address Space — See where code, data, heap, and stack live.
• Scheduling & Context Switch — One CPU, many processes, taking turns.