System Administration
# Operating systems, shells, networking & CLI tooling, day-to-day sysadmin practice.
❯ cat documents/
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Linux system deep dive
Concept
2026-08-08
Linux internals for engineers — processes, memory, filesystems, networking stack, cgroups/namespaces, and the observability tooling.
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Networking fundamentals
Concept
2026-08-08
The protocols under everything — TCP/UDP, TLS, HTTP/1.1→3, DNS — and the tools to see them on the wire.
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Git internals
Concept
2026-08-08
The content-addressed object model under the porcelain — blobs, trees, commits, refs, and why the reflog means almost nothing is ever lost.
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Check which process is listening on a given port
Concept
2026-08-03
Five CLI ways per OS (Windows and Linux) to find the process listening on a port.
❯ tree collections/
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Exercises/
6 items
curated build projects that drill the system-administration concepts hands-on.