Detecting Command Injection Patterns

Q: What is a Claude Code skill and how does the Detecting Command Injection Patterns skill fit in?

A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Detecting Command Injection Patterns is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Security category. Learn more at https://claudskills.com/learn/what-is-skill-md/.

Category: Security · Sub-category: threat-hunting · Last updated: 2026-06-01

lang:python type:audit

Scan a source tree for command-injection vulnerable patterns: shell=True calls in Python subprocess, os.system / os.popen with interpolated strings, Node child_process.exec with template literals, Ruby backticks / Kernel#system / Kernel#exec with interpolation, Go exec.Command with shell wrapping, PHP system / passthru / shell_exec / backticks with $-interpolation, Java Runtime.exec with concatenated args. Use when: pre-commit gate on code that calls out to shell utilities, audit of file-processing / archive-handling / image-conversion code, post-bug-report investigation for "we shell out to a tool." Threshold: any shell-invocation API called with a string that contains a variable interpolation, OR shell=True with anything other than a fixed literal. Trigger with: "scan command injection", "shell=True audit", "find exec calls", "check os.system".

About this skill (catalog notes)

Detecting Command Injection Patterns includes a dedicated installation section; worked examples; at least one code block. The SKILL.md is on the shorter side at about 516 words.

Source: tonsofskills.com
License: MIT
Original author: Jeremy Longshore <[email protected]>
Indexed lastmod: 2026-06-01
Catalog position: Security · threat-hunting
Indexed related skills: 10

How Detecting Command Injection Patterns fits the catalog

Detecting Command Injection Patterns sits in the Security category under the threat-hunting sub-topic in the ClaudSkills catalog. There are 10 related skills indexed alongside it; comparing a few before installing usually reveals which fits your workflow best.

These notes are auto-generated from features detected in the SKILL.md file and from this catalog's structure — they aren't part of the source repository.

What this skill does

Detecting Command Injection Patterns is a community-contributed Claude Code skill in the threat-hunting sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/detecting-command-injection-patterns/ and loads when your prompt matches the skill's trigger.

When to invoke it: Use when: pre-commit gate on code that calls out to shell utilities, audit of file-processing / archive-handling / image-conversion code, post-bug-report investigation for "we shell out to a tool." Threshold: any shell-invocation API called with a string that contains a variable interpolation, OR shell=True with anything other than a fixed literal.

Who uses this skill

The Detecting Command Injection Patterns Claude Code skill is built for security engineers, penetration testers, DevSecOps practitioners, and development teams hardening codebases and infrastructure. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 88,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/detecting-command-injection-patterns
curl -L https://claudskills.com/skills/detecting-command-injection-patterns/SKILL.md \
  -o ~/.claude/skills/detecting-command-injection-patterns/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/detecting-command-injection-patterns/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/detecting-command-injection-patterns/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\detecting-command-injection-patterns\SKILL.md on Windows. See the full install guide for step-by-step instructions.

Pro

One-click install via the desktop app

The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.

Pro

For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.

See pricing → Download desktop app

Frequently asked questions

How do I install the Detecting Command Injection Patterns Claude Code skill?

Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/detecting-command-injection-patterns/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.

What does the Detecting Command Injection Patterns skill do?

Is this skill free to install?

Yes. ClaudSkills is an open registry — every skill keeps its source repository's license, and manual install via copy is free. ClaudSkills Pro ($9/mo, $79/yr, or $149 one-time) adds one-click install via the desktop app and a multi-signal Quality Score.

When should I use the Detecting Command Injection Patterns skill?

Use Detecting Command Injection Patterns when your Claude Code task falls under the Security category — specifically in the threat hunting area. Claude Code auto-discovers installed skills and invokes the right one based on the task description, so you can also ask Claude directly (e.g. "use Detecting Command Injection Patterns" or describe the task and let Claude pick). Browse related skills at /category/security/.

What is a Claude Code skill and how does the Detecting Command Injection Patterns skill fit in?

A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Detecting Command Injection Patterns is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Security category. Learn more at /learn/what-is-a-claude-skill/.

Attribution & license

Source: https://github.com/jeremylongshore/claude-code-plugins-plus-skills/blob/HEAD/plugins/security/penetration-tester/skills/detecting-command-injection-patterns/SKILL.md
License: MIT
Author: Jeremy Longshore <[email protected]>
Website: https://tonsofskills.com

Cite this skill

If you reference this skill in a blog post, paper, or documentation, you can cite it as:

APA

Jeremy Longshore <[email protected]>. (2026). Detecting Command Injection Patterns [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/detecting-command-injection-patterns/

BibTeX

@misc{detecting-command-injection-patterns-2026,
  author    = {Jeremy Longshore <[email protected]>},
  title     = {Detecting Command Injection Patterns [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/detecting-command-injection-patterns/}
}

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