01
command / beginner
What happens when you press Enter?
Follow ls -la from a terminal keystroke through shell parsing, command lookup, process replacement, filesystem calls, and pixels on screen.
Published →
Visual field notes for Linux
The machine makes more sense when you can see inside.
Durable explanations of the invisible work beneath everyday commands—drawn layer by layer, sourced from the system, and safe to test yourself.
Live model / command path
static-firstswipe →
Launch dossier / 001–005
Five systems worth seeing clearly.
Not command recipes. Working models you can carry from one distribution, incident, and machine to the next.
02
permissions / beginner
Linux permissions, visualized as operations
Stop memorizing 755. Read owner, group, and other permissions as answers to concrete file and directory operations.
Published →
03
pipe / intermediate
What a pipe actually does
Replace the punctuation model of `|` with connected processes, file descriptors, bounded kernel buffers, and backpressure.
Published →
04
disk / intermediate
Why df and du disagree
Reconcile filesystem allocation with files a directory walk can reach, then diagnose gaps without reaching for a cleanup command.
Published →
05
memory / intermediate
Linux memory beyond used versus free
Read RAM as anonymous memory, reclaimable cache, kernel state, swap, and pressure—then separate host capacity from cgroup limits.
Published →
Our method
Inspect first.
Change second.
Linux rewards curiosity, but unexplained commands teach dependency. Every note starts with a mental model, shows the evidence, then offers a lab.
- 01Draw the boundary
Name what is simplified and what is implementation detail.
- 02Follow the evidence
Prefer man pages, kernel docs, project docs, and source.
- 03Make it testable
Read-only inspection before mutation; warnings beside risk.