The layer everything else sits on — the machine, the kernel, the shell, and the code you drive them with.
How this category fits together, bottom to top. Every green block is covered by a published issue — click it to go straight there.
7 issues covering 7 of the 10 topics here.
190 terms across 15 categories, searchable, with deep-dive term pages.
Filesystem hierarchy, users and permissions, packages, processes, shell scripting.
Caches, translation, interrupts, and the six orders of magnitude between L1 and a disk seek.
The syscall boundary, the scheduler, the page cache, cgroups, and the failures each one causes.
Expansion order, exit codes, redirection, strict mode's blind spots, traps and parallelism.
The GIL, choosing a concurrency model, streaming large files, subprocess and logging.
The object model, the three trees, reflog recovery, bisect, and repository weight.
The commands for this, in a searchable reference.
The other categories sitting alongside this one.