4 micro-topics in Systems & Tooling, each with the evidence that proves you have it and the written reason behind every link. Before you start, it rests on 2 other domains. Downstream, it holds up 1 domain.
4 topics · depth 3–5 of 16 · 3 internal links · 2 in · 1 out
Load-bearing links first. Each one says what in this domain rests on what outside it, and why.
1 link
Reason about stdin, stdout and stderr rests on Inspect file contents
Streams are the abstraction behind reading and writing files.
1 link
Compose commands with pipes rests on Search text with grep
Pipelines are only worth building once you have tools to chain.
In prerequisite order. Each idea names the artifact that closes it, the market demand that put it on the map, and what it stands on.
Depth 3 · conceptual · unassisted · M01 §1.4
Knows which stream output is going to
Inspect file contents · Filesystem
Streams are the abstraction behind reading and writing files.
Depth 4 · procedural · unassisted · M01 §1.4
Applies >, >>, 2> and 2>&1 correctly
Reason about stdin, stdout and stderr
Redirection sends a stream somewhere, so the stream comes first.
Depth 4 · procedural · unassisted · M01 §1.4
Chains tools so one's output feeds the next
Reason about stdin, stdout and stderr
A pipe connects one command's stdout to another's stdin.
Search text with grep · Text Processing
Pipelines are only worth building once you have tools to chain.
Depth 5 · procedural · scaffolded · M01 §1.4
Uses $(command) and xargs to pass values along
Substitution is the next step after chaining output.
Everything downstream that names an idea here as a prerequisite, grouped by where it lives.
1 link
Write and run a shell script rests on Compose commands with pipes
A script is a saved pipeline plus control flow.
Retool. Retrain. Relaunch.
375 ideas. 17 weeks. No tuition, ever.
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