A command-line language and shell used mainly on Linux and macOS. Shell scripts run system commands, connect their output, and manipulate files.

Use it to automate system tasks, file operations, command-line workflows, and CI/CD pipelines.

It removes repetitive manual work from system administration, development tasks, and build pipelines. Exit codes and error-handling options help scripts detect failures.

bash — Skill for Claude Code and Codex by G1Joshi: A command-line language and shell used mainly on Linux…

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/g1joshi/agent-skills/bash

Any agent

npx skills add G1Joshi/Agent-Skills --skill bash

Clone the repo

git clone --depth 1 https://github.com/G1Joshi/Agent-Skills

Made for: Claude Code, Codex.

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/g1joshi/agent-skills/bash.svg)](https://agentmods.dev/skills/g1joshi/agent-skills/bash)

Your own site

<a href="https://agentmods.dev/skills/g1joshi/agent-skills/bash"><img src="https://agentmods.dev/badge/skills/g1joshi/agent-skills/bash.svg" alt="Measured on agentmods" height="20"></a>

Per session 24 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 367 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.

Model	Per session	Once invoked
Fable 5	$0.00024	$0.00367
Opus 5	$0.00012	$0.00183
Sonnet 5	$0.00005	$0.00073
Haiku 4.5	$0.00002	$0.00037

Measured yesterday against content hash 2ac9bf6f3b17, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, 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 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.

skills/languages/bash/SKILL.md · 75 lines

What it actually says

Bash

Bourne Again SHell, the standard shell for Linux and macOS.

When to Use

Automating system tasks
CI/CD pipelines
File manipulation
Glue code between CLIs

Quick Start

#!/bin/bash

NAME="World"
echo "Hello, $NAME!"

if [ -f "file.txt" ]; then
    echo "File exists"
else
    echo "File not found"
fi

Core Concepts

Variables

No data types. Everything is a string.

count=10
echo $count

Pipes and Redirection

|: Pipe output of one command to input of next.
>: Redirect output to file (overwrite).
>>: Redirect output to file (append).

cat file.txt | grep "error" > errors.log

Exit Codes

Commands return 0 for success and non-zero for failure. Check with $?.

Best Practices

Do:

Use set -e (e)xit on error
Use set -u (u)nset variable usage is error
Use set -o pipefail to catch errors in pipes
Quote variables "$VAR" to handle spaces

Don't:

Parse ls output (use globs *)
Use simple [ vs [[ (double brackets are safer)

References

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.

yesterday First seen · 75 lines · 24 tokens per session scan A 2ac9bf6f3b17

Subscribe to this mod's changes

bash is a skill published in the GitHub repository G1Joshi/Agent-Skills (12 stars, last pushed 6mo ago), licensed MIT. It adds 24 tokens to every session and 367 once invoked, about $0.0001 per session on Opus 5. 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 2026-09-03.

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bash