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 3 other domains. Downstream, it holds up 2 domains.
4 topics · depth 6–9 of 16 · 3 internal links · 3 in · 2 out
Load-bearing links first. Each one says what in this domain rests on what outside it, and why.
1 link
Write and run a shell script rests on Configure PATH
Running a script by name requires PATH resolution.
1 link
Write and run a shell script rests on Compose commands with pipes
A script is a saved pipeline plus control flow.
1 link
Handle exit codes and errors rests on Control jobs and signals
Exit codes are the signal side of process control.
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 6 · procedural · unassisted · M01 §1.9
Adds a shebang and makes a file executable
Compose commands with pipes · Streams & Pipes
A script is a saved pipeline plus control flow.
Configure PATH · Shell Configuration
Running a script by name requires PATH resolution.
Depth 7 · procedural · unassisted · M01 §1.9
Passes and defaults arguments in scripts
Variables parameterize a script that already runs.
Depth 8 · procedural · unassisted · M01 §1.9
Applies if, test, for and while
Use variables and parameter expansion
Conditions and loops act on variables.
Depth 9 · conceptual · unassisted · M01 §1.9
Checks status and fails loudly
Error handling requires the branches that detect the error.
Control jobs and signals · Processes & Signals
Exit codes are the signal side of process control.
Everything downstream that names an idea here as a prerequisite, grouped by where it lives.
1 link
Containerize an application rests on Write and run a shell script
A Dockerfile is a build script.
1 link
Distinguish a harness from an execution layer rests on Handle exit codes and errors
Exit codes are the simplest pass-fail signal a harness reads.
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