shell-scripting

A guide to Bash and Zsh, command-line shells used to run programs and automate tasks on Unix-like systems.

In plain words
What is it for?
Use it to create, debug, optimize, or automate tasks with Bash, Zsh, and command-line tools.
Why use it?
It helps you write, troubleshoot, and improve shell scripts without having to piece together shell syntax and command-line practices yourself.

Skill for Claude CodeCodex

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/einverne/dotfiles/shell-scripting
Any agent
npx skills add einverne/dotfiles --skill shell-scripting
Clone the repo
git clone --depth 1 https://github.com/einverne/dotfiles

Made for: Claude Code, Codex.

Per session 47 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,008 The whole file, excluding the scripts and references it only reads on demand.
Security scan C 1 finding. Scan, not verified.
Origin unknown No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00047 $0.01008
Opus 5 $0.00023 $0.00504
Sonnet 5 $0.00009 $0.00202
Haiku 4.5 $0.00005 $0.00101

Measured 2d ago against content hash 5a04b924f110, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade C, and why

shell-scripting scanned grade C with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Recursive force deletehighDestructive command

rm -rf with a variable or a broad path is one typo away from removing the wrong tree.

- Be careful with `rm -rf`
claude/skills/shell-scripting/SKILL.md · 171 lines

The source is not reproduced here

Licensed GPL-3.0

The repository is licensed GPL-3.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.

Read it on GitHub

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 2d ago First seen · 171 lines · 47 tokens per session scan C 5a04b924f110

Subscribe to this mod's changes

shell-scripting is a skill published in the GitHub repository einverne/dotfiles (121 stars, last pushed 4d ago), licensed GPL-3.0. It adds 47 tokens to every session and 1,008 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it C with 1 finding (recursive force delete). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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