# Knowledge

> Search Hacker News, Wikipedia, DuckDuckGo, RFC docs, and Stack Exchange from the command line. Zero barrier — install x-cmd and start searching. Use for "search", "hn", "hacker news", "wikipedia", "ddgo", "duckduckgo", "rfc", "stack overflow".

- Skill: `x-cmd/knowledge` (Agent Skill)
- Install (CLI): `npx skillmds@latest add x-cmd/knowledge`
- Raw SKILL.md: https://api.skillmd.com/api/skills/x-cmd/knowledge/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: x-cmd (https://skillmd.com/u/x-cmd)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/x-cmd/knowledge

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# knowledge — skill0

Search the internet's knowledge sources from the command line.

## Quick Start

```bash
# Install x-cmd
eval "$(curl https://get.x-cmd.com)"

# Hacker News top posts
x hn top

# Wikipedia search
x wkp "artificial intelligence"

# DuckDuckGo search
x ddgo "rust programming language"

# RFC documents
x rfc 2616

# Stack Exchange search
x se "how to exit vim"
```

## What's Available

| Command | Source | Example |
|---------|--------|---------|
| `x hn top` | Hacker News | Top 10 trending posts |
| `x hn new` | Hacker News | Latest submissions |
| `x wkp <query>` | Wikipedia | Search articles |
| `x ddgo <query>` | DuckDuckGo | Web search |
| `x rfc <number>` | RFC docs | Read RFC specifications |
| `x se <query>` | Stack Exchange | Search Q&A |

## This skill0 grows

Starting with the essentials. Will add:
- More sources (Project Gutenberg, arxiv)
- Advanced search patterns
- Result filtering and formatting tips

## Full experience

`x knowledge --help` for all options after installing x-cmd.

## Related