bash

bash is a cursor rule for Cursor from AcKeskin/contexture. It costs 0 tokens per session (923 once invoked), scanned A, original, MIT.

A set of rules for writing safer Bash shell scripts. Bash is a command-line scripting language, and these rules cover quoting values, passing arguments, testing conditions, command substitution, and constructing multi-line Git messages.

In plain words
What is it for?
Use it when writing or reviewing Bash commands and scripts, especially code that handles file paths, arrays, command arguments, tests, or Git commits.
Why use it?
It helps avoid bugs where spaces or wildcard characters change a command's meaning, arguments are combined incorrectly, or malformed commit messages are created.

Cursor rule for Cursor

Written for Cursor: a Cursor rule (.mdc).

Good fit Use it when writing or reviewing Bash commands and scripts, especially code that handles file paths, arrays, command arguments, tests, or Git commits.

Compare 6 cursor rules from other repositories ↓
Install with agentmods
npx agentmods add rules/ackeskin/contexture/bash
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.

Clone the repo
git clone --depth 1 https://github.com/AcKeskin/contexture

Made for: Cursor.

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.

agentmods badge for bash

README.md
[![agentmods](https://agentmods.dev/badge/rules/ackeskin/contexture/bash/github.svg)](https://agentmods.dev/rules/ackeskin/contexture/bash)
Your own site
<a href="https://agentmods.dev/rules/ackeskin/contexture/bash"><img src="https://agentmods.dev/badge/rules/ackeskin/contexture/bash/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.

agentmods 80×15 button for bash

Your own site · 80×15
<a href="https://agentmods.dev/rules/ackeskin/contexture/bash"><img src="https://agentmods.dev/badge/rules/ackeskin/contexture/bash.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 0 Nothing until a file matches its globs; then the whole rule loads.
When invoked 923 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
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 5.1 $0.00000 $0.00923
Opus 5.5 $0.00000 $0.00369
Sonnet 5.5 $0.00000 $0.00185
Haiku 4.5 $0.00000 $0.00092

Measured today against content hash b315aad81b89, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

bash 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 today.

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.

cursor/rules/bash.mdc · 38 lines

How it starts

The opening of the file, as written. The whole thing — 38 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Generated from architectural-rules/bash/ — do not hand-edit.

Bash quoting

Quote every variable expansion: "$var", "${arr[@]}". Unquoted expansions word-split and glob-expand — the source of nearly every "works until a path has a space" bug. Use "$@" (not $*, not unquoted $@) to forward arguments — it preserves each argument as a separate quoted word. $* joins them into one string. Use [[ ... ]] over [ ... ] for tests — no word-splitting inside, supports &&/||/=~, and doesn't break on empty variables. Use $(command) over backticks for command substitution — it nests cleanly and is readable. ⚠ Never use PowerShell here-string syntax (@'...'@) inside a bash command. Bash parses @'text'@ as a literal @, then a single-quoted string, then a trailing @ — so a leading @ leaks silently into the output. A leading @ then silently prefixes the commit subject. For multi-line commit messages in bash use $'line1\nline2', a real here-doc (-F - with <<'EOF'), or -F <file>. Read back the subject (git log -1 --format=%s) after committing to catch it.

Why: unquoted expansion is the single most common shell bug class — it passes every test with simple inputs and breaks the moment a filename has a space or a variable is empty. Source: Google Shell Style Guide, ShellCheck (SC2086). The here-string landmine is sharper on Windows where PowerShell is the other shell in muscle memory — the syntaxes look interchangeable and are not.

Bash safety

Start scripts with set -euo pipefail: -e exit on error, -u error on unset variable, -o pipefail so a failure anywhere in a pipe fails the pipe. Without these, errors are silently ignored and the script charges on. Set IFS=$'\n\t' when word-splitting matters — the default IFS splits on spaces too and mangles paths/filenames with spaces. Clean up with trap 'cleanup' EXIT — temp files and locks get removed even on early exit or error. Don't rely on reaching a cleanup line at the bottom. Verify required commands exist up front (command -v jq >/dev/null || { echo "jq required" >&2; exit 1; }) instead of failing cryptically halfway through. Terminate only the process you started, by the PID you captured (kill "$pid"). Never pkill / kill / taskkill by name or pattern — name-matching also kills unrelated processes (e.g. pkill godot to stop a headless run also takes down the user's open editor).

Read the full file on GitHub · 38 lines

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. today First seen · 38 lines · 923 tokens per session scan A b315aad81b89

Subscribe to this mod's changes

bash is a cursor rule published in the GitHub repository AcKeskin/contexture (2 stars, last pushed yesterday), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 923 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 2026-10-27.