coding-styleguide-sh

A set of best practices for writing shell scripts that stop on errors and work across common environments. Shell scripts are command-line programs used to automate system and development tasks.

In plain words
What is it for?
Adding safe error handling, configuring strict shell behavior, and writing portable scripts for Linux, macOS, and Windows WSL.
Why use it?
It reduces silent failures and avoids breaking when commands fail or file names contain spaces.

Cursor rule

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 rules/peerigon/configs/coding-styleguide-sh
Clone the repo
git clone --depth 1 https://github.com/peerigon/configs
Per session 0 Nothing until a file matches its globs; then the whole rule loads.
When invoked 115 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original 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 $0.00000 $0.00115
Opus 5 $0.00000 $0.00057
Sonnet 5 $0.00000 $0.00023
Haiku 4.5 $0.00000 $0.00012

Measured yesterday against content hash 4b48b82c3199, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

coding-styleguide-sh scanned grade A with 0 findings 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 yesterday.

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.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

ai/coding-styleguide-sh.mdc · 17 lines

What it actually says

Shell scripts

  • Prepend all shell scripts with
set -o errexit  # exit when there was a single error
set -o pipefail # fail when there was a pipe error
set -o nounset  # fail when an env variable is not set
  • Make sure that shell scripts also work when file names contain spaces
  • Prefer commands that work on Linux, MacOS and Windows WSL
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. yesterday First seen · 17 lines · 115 tokens per session scan A 4b48b82c3199

Subscribe to this mod's changes

coding-styleguide-sh is a cursor rule published in the GitHub repository peerigon/configs (4 stars, last pushed 20d ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 115 tokens. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.