What is bash-hardening?

A guide for writing reliable Bash scripts, especially scripts used in installers, automation, and continuous integration. Bash is a command-line scripting language with subtle rules around errors, quoting, arrays, traps, and shell versions.

It is for hardening non-trivial Bash scripts and checking error handling, word splitting, traps, arrays, process substitution, version compatibility, and ShellCheck findings.

It helps prevent scripts that appear correct but fail on unexpected input, errors, or different environments.

bash-hardening — Skill for Claude Code by pvillega/claude-templates

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.

Any agent

npx skills add pvillega/claude-templates --skill bash-hardening

Clone the repo

git clone --depth 1 https://github.com/pvillega/claude-templates

Made for: Claude Code.

Or install ct, the plugin that ships this one along with the rest of its 38 skills, 7 agents, 7 hooks.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/pvillega/claude-templates/bash-hardening/github.svg)](https://agentmods.dev/skills/pvillega/claude-templates/bash-hardening)

Your own site

<a href="https://agentmods.dev/skills/pvillega/claude-templates/bash-hardening"><img src="https://agentmods.dev/badge/skills/pvillega/claude-templates/bash-hardening/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/pvillega/claude-templates/bash-hardening"><img src="https://agentmods.dev/badge/skills/pvillega/claude-templates/bash-hardening.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 146 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 4,259 The whole file, excluding the scripts and references it only reads on demand.

Security scan B 1 finding. A grade says what 26 rules found in the file — not that it is safe.

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.

Model	Per session	Once invoked
Fable 5.1	$0.00146	$0.04259
Opus 5.5	$0.00058	$0.01704
Sonnet 5.5	$0.00029	$0.00852
Haiku 4.5	$0.00015	$0.00426

Measured 2mo ago against content hash 9a58e8dfa5c5, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade B, and why

bash-hardening scanned grade B 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 2mo 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 deletemediumDestructive command

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

trap 'rm -rf -- "$tmpdir"' EXIT

Downgraded: this mod is about security review, or the phrase is quoted, so it is likely naming the pattern rather than instructing it.

plugins/ct/skills/bash-hardening/SKILL.md · 200 lines

The source is not reproduced here

No licence file

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.

2mo ago First seen · 200 lines · 146 tokens per session scan B 9a58e8dfa5c5

Subscribe to this mod's changes

bash-hardening is a skill published in the GitHub repository pvillega/claude-templates (23 stars, last pushed 3mo ago), with no licence file. It adds 146 tokens to every session and 4,259 once invoked, about $0.0006 per session on Opus 5.5. A static security scan graded it B 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.

DevOps and cloud Languages

bash-hardening next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
bash-hardeningpvillega/claude-templates	Skill	23	3mo ago	none	B	146	Claude Code
omh-rustrlaope/oh-my-hermes	Skill	5.3k	today	MIT	A	74	Claude Code, Codex
erlang-otp-behaviorsbenchflow-ai/skillsbench	Skill	1.9k	6d ago	Apache-2.0	A	52	Claude Code, Codex
axiom-concurrencyCharlesWiltgen/Axiom	Skill	1.3k	yesterday	MIT	A	49	Claude Code
tddcodewithmukesh/dotnet-claude-kit	Skill	811	5d ago	MIT	A	81	Claude Code
haskell-prormyndharis/antigravity-skills	Skill	2.0k	2d ago	MIT	A	37	Claude Code, Codex
precisemicroprediction/precise	Skill	338	8d ago	MIT	A	76	Claude Code, Codex

bash-hardening

Getting it into your agent

Wrote this? Show the measurements

What it costs to keep this loaded

Grade B, and why

Recursive force deletemediumDestructive command

The source is not reproduced here

No licence file

What this file has done since we first saw it

bash-hardening compared with skills from other repositories