https://laohand.com/index.html New and updated developer command cheatsheets — Docker, Kubernetes, Git, Linux, databases, languages and more. Find fast, copy directly. zh-CN Wed, 05 Aug 2026 00:00:00 GMT https://laohand.com/aider.html https://laohand.com/aider.html All Aider terminal AI pair-programming commands in one place — from install to model switching, file context to architect mode — organized by scenario. Copy and go. · Sections: Install & Start, Model & Reasoning, Files & Context · e.g. pip install aider-chat, aider, aider src/main.py tests/test_main.py Wed, 05 Aug 2026 00:00:00 GMT ai-cli https://laohand.com/cursor.html https://laohand.com/cursor.html All Cursor editor CLI and Agent commands in one place — from opening files to diff compare, extension management, and Agent calls — organized by scenario. Copy and go. · Sections: Open Files & Folders, Window Management, Diff & Merge · e.g. cursor ., cursor /path/to/file.ts, cursor /path/to/file.ts:42 Wed, 05 Aug 2026 00:00:00 GMT ai-cli https://laohand.com/gemini-cli.html https://laohand.com/gemini-cli.html All Gemini CLI terminal AI agent commands in one place — from install & auth to headless exec, approval modes, and MCP/extensions — organized by scenario. Copy and go. · Sections: Install & Auth, Run Modes, Global Flags · e.g. npm install -g @google/gemini-cli, gemini --version, gemini Wed, 05 Aug 2026 00:00:00 GMT ai-cli https://laohand.com/codex-cli.html https://laohand.com/codex-cli.html All Codex CLI terminal coding agent commands in one place — from install & login to non-interactive exec, sandbox approval, and MCP — organized by scenario. Copy and go. · Sections: Install & Auth, Interactive Mode, Non-interactive (codex exec) · e.g. npm install -g @openai/codex, brew install --cask codex, codex --version Wed, 05 Aug 2026 00:00:00 GMT ai-cli https://laohand.com/claude-code.html https://laohand.com/claude-code.html All Claude Code terminal AI coding agent commands in one place — from install & auth to print/resume sessions, permission modes, and MCP — organized by scenario. Copy and go. · Sections: Install & Auth, Launch & Run, CLI Flags · e.g. npm install -g @anthropic-ai/claude-code, claude --version, npm update -g @anthropic-ai/claude-code Wed, 05 Aug 2026 00:00:00 GMT ai-cli https://laohand.com/http-methods.html https://laohand.com/http-methods.html When designing REST APIs you often wonder PUT vs PATCH, or which is idempotent. Grouped by method semantics, idempotency, safe attributes and status-code pairing, with copy-ready examples. · Sections: Core Methods, Idempotency & Safety, Status Pairing · e.g. GET, POST, PUT Sun, 02 Aug 2026 00:00:00 GMT reference https://laohand.com/dockerignore.html https://laohand.com/dockerignore.html Without a proper .dockerignore the build context ships node_modules and .git into the daemon. Grouped by globs, directory ignores, differences from .gitignore and context slimming, with copy-ready examples. · Sections: Basic Syntax, Glob Patterns, Common Ignores · e.g. node_modules, *.log, tmp/ Sun, 02 Aug 2026 00:00:00 GMT config https://laohand.com/env.html https://laohand.com/env.html The format and pitfalls you forget when writing .env or loading config with dotenv, grouped by definition, framework integration and security, with copy-ready examples. · Sections: Definition, Reading, dotenv Usage · e.g. KEY=value, KEY="value with space", KEY='literal $NOT_EXPANDED' Sun, 02 Aug 2026 00:00:00 GMT config https://laohand.com/regex.html https://laohand.com/regex.html The most-used, easiest-to-forget regex syntax in one place: characters, quantifiers, groups, assertions, each with practical examples. Copy directly when tuning validation or matching rules. · Sections: Character Classes, Anchors, Quantifiers · e.g. [abc], [^abc], [a-z] Sun, 02 Aug 2026 00:00:00 GMT regex https://laohand.com/sql.html https://laohand.com/sql.html The most-used, easiest-to-forget SQL syntax in one place: queries, joins, aggregation, window functions and transactions, with copy-ready examples. · Sections: Basic Query, Filtering & Logic, Aggregation & Grouping · e.g. SELECT * FROM users, SELECT name, age FROM users, SELECT * FROM users WHERE age > 18 Sun, 02 Aug 2026 00:00:00 GMT db https://laohand.com/web-fetch.html https://laohand.com/web-fetch.html Downloading files, calling APIs and debugging HTTP — curl and wget are the go-to CLI tools. Grouped by requests, download, auth and debugging, with a side-by-side comparison and copy-ready examples. · Sections: Basic Requests, HTTP Method, Headers & Cookies · e.g. curl https://api.test, curl -O https://x/file.zip, curl -o out.html https://x Sun, 02 Aug 2026 00:00:00 GMT web https://laohand.com/gitignore.html https://laohand.com/gitignore.html The glob syntax and pitfalls you forget when writing .gitignore, grouped by wildcards, directories, negation and global config, with copy-ready examples. · Sections: Basic Syntax, Wildcards & Comments, Dirs & Files · e.g. *.log, build/, /dist Sun, 02 Aug 2026 00:00:00 GMT vcs https://laohand.com/slack-shortcuts.html https://laohand.com/slack-shortcuts.html High-frequency Slack collaboration shortcuts organized by Messages, Channels, Navigation, Search, and Formatting. macOS and Windows side-by-side for daily communication. · Sections: Messages, Channels, Navigation · e.g. Enter / Enter, Shift+Enter / Shift+Enter, ↑ / ↑ Fri, 31 Jul 2026 00:00:00 GMT shortcuts https://laohand.com/chrome-shortcuts.html https://laohand.com/chrome-shortcuts.html High-frequency Chrome browser shortcuts organized by Tabs, Windows, Browsing, Address Bar, DevTools, and Mouse. macOS and Windows side-by-side for browsing and front-end debugging. · Sections: Tabs, Windows, Browsing · e.g. Cmd+T / Ctrl+T, Cmd+W / Ctrl+W, Cmd+Shift+T / Ctrl+Shift+T Fri, 31 Jul 2026 00:00:00 GMT shortcuts https://laohand.com/windows-shortcuts.html https://laohand.com/windows-shortcuts.html High-frequency Windows system shortcuts organized by General, File Explorer, Screenshots, Window Management, System, and Command Line. Quick reference for daily Windows usage. · Sections: General, File Explorer, Screenshots · e.g. Win, Win+S, Win+I Fri, 31 Jul 2026 00:00:00 GMT shortcuts https://laohand.com/macos-shortcuts.html https://laohand.com/macos-shortcuts.html High-frequency macOS system shortcuts organized by General, Finder, Screenshots, Window Management, System, and Text Editing. Quick reference for daily Mac usage. · Sections: General, Finder, Screenshots · e.g. Cmd+Space, Cmd+Tab, Cmd+Shift+Tab Fri, 31 Jul 2026 00:00:00 GMT shortcuts https://laohand.com/vscode-shortcuts.html https://laohand.com/vscode-shortcuts.html High-frequency VSCode keyboard shortcuts organized by General, Editing, Navigation, Search, Window Management, and Terminal. macOS and Windows side-by-side for quick reference while coding. · Sections: General, Editing, Navigation · e.g. Cmd+Shift+P / Ctrl+Shift+P, Cmd+P / Ctrl+P, Cmd+Shift+N / Ctrl+Shift+N Fri, 31 Jul 2026 00:00:00 GMT shortcuts https://laohand.com/midjourney-prompts.html https://laohand.com/midjourney-prompts.html Midjourney AI art prompts and parameters organized by Basics, Style, Composition, Lighting, Negative & Weights, and Advanced. Combine parameters and generate. · Sections: Basic Parameters (--ar/--v/--q/--n), Style Keywords (photorealistic/anime/oil painting), Composition & Camera (close-up/wide angle/aerial) · e.g. --ar 16:9, --ar 9:16, --ar 1:1 Fri, 31 Jul 2026 00:00:00 GMT ai-prompt https://laohand.com/claude-prompts.html https://laohand.com/claude-prompts.html Claude prompt templates that leverage 200K context and Constitutional AI, organized by Long Docs, Code, Role-play, Structured Output, Multi-turn, and Safety. Copy and go. · Sections: Long Document Processing (200K Context), Code Generation & Analysis, Role-play & System Prompts · e.g. Read the following long document and answer the question. Document: {long doc} Question: {question}, Compare the following two long documents across structure, content, and viewpoints: Doc A: {doc A} Doc B: {doc B}, Distill the following 50-page meeting notes into an executive summary with: key decisions, action items, owners, deadlines: {notes} Fri, 31 Jul 2026 00:00:00 GMT ai-prompt https://laohand.com/chatgpt-prompts.html https://laohand.com/chatgpt-prompts.html Essential ChatGPT prompt templates organized by Role Setting, Structured Output, Code, Text Processing, Few-shot, and Chain of Thought. Copy a template, fill the variables, and ship. · Sections: Role Setting (System Role), Structured Output (JSON/Table/Markdown), Code (Generate/Review/Explain/Refactor) · e.g. You are a senior {domain} expert with 10+ years of experience. Answer the following in a professional yet accessible way: {question}, As a {role}, complete the following task strictly following {standard/spec}: {task}, Your identity is {role}, your goal is {goal}, your constraints are {constraints}. Begin: {input} Fri, 31 Jul 2026 00:00:00 GMT ai-prompt https://laohand.com/datetime.html https://laohand.com/datetime.html All essential Date & Time Format commands organized by use case, with 50+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: strftime Format Specifiers, ISO 8601 Standard, Timezone & Offset · e.g. %Y, %y, %m Tue, 21 Jul 2026 00:00:00 GMT reference https://laohand.com/cidr.html https://laohand.com/cidr.html All essential CIDR commands organized by use case, with 34+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: CIDR Notation Basics, Subnet Mask Reference, Common Subnet Sizes · e.g. 192.168.1.0/24, IP/前缀, /24 Tue, 21 Jul 2026 00:00:00 GMT reference https://laohand.com/rest-api.html https://laohand.com/rest-api.html All essential RESTful API commands organized by use case, with 46+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: URL Design Spec, HTTP Methods, Common Status Codes · e.g. /api/v1/users, /api/v1/users/123, /api/v1/users/123/orders Tue, 21 Jul 2026 00:00:00 GMT reference https://laohand.com/semver.html https://laohand.com/semver.html All essential SemVer commands organized by use case, with 33+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Version Number Structure, Pre-release & Build Metadata, Version Comparison Operators · e.g. MAJOR.MINOR.PATCH, 1.2.3, MAJOR：不兼容的 API 变更 Tue, 21 Jul 2026 00:00:00 GMT reference https://laohand.com/iso-639-1.html https://laohand.com/iso-639-1.html All essential ISO 639-1 commands organized by use case, with 49+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Asian Languages, European Languages, Middle East & African Languages · e.g. zh, zh-CN, zh-TW Tue, 21 Jul 2026 00:00:00 GMT reference https://laohand.com/aspect-ratio.html https://laohand.com/aspect-ratio.html All essential Screen Resolution & Aspect Ratio commands organized by use case, with 38+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Phone Resolutions, Tablet Resolutions, Laptop Resolutions · e.g. 320 × 480, 640 × 960, 750 × 1334 Tue, 21 Jul 2026 00:00:00 GMT reference https://laohand.com/emoji-unicode.html https://laohand.com/emoji-unicode.html All essential Emoji Unicode commands organized by use case, with 48+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Smileys & Emotion, Gestures, Hearts · e.g. 😀 U+1F600, 😂 U+1F602, 😊 U+1F60A Tue, 21 Jul 2026 00:00:00 GMT reference https://laohand.com/html-char-entities.html https://laohand.com/html-char-entities.html All essential HTML Character Entities commands organized by use case, with 38+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Basic Characters, Common Symbols, Currency Symbols · e.g. &amp; 或 &#38;, &lt; 或 &#60;, &gt; 或 &#62; Tue, 21 Jul 2026 00:00:00 GMT reference https://laohand.com/mime-types.html https://laohand.com/mime-types.html All essential MIME Types commands organized by use case, with 47+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Text Types, Image Types, Audio/Video Types · e.g. text/html, text/css, text/javascript Tue, 21 Jul 2026 00:00:00 GMT reference https://laohand.com/ascii-code.html https://laohand.com/ascii-code.html All essential ASCII Code commands organized by use case, with 61+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Control Characters (0-31, 127), Printable Characters (32-126), Common Control Characters · e.g. 0 (0x00), 3 (0x03), 4 (0x04) Tue, 21 Jul 2026 00:00:00 GMT reference https://laohand.com/latex.html https://laohand.com/latex.html All essential LaTeX commands organized by use case, with 45+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Document Structure, Text Formats, Math Formulas · e.g. \documentclass{article}, \usepackage[utf8]{inputenc}, \usepackage{amsmath} Tue, 21 Jul 2026 00:00:00 GMT latex https://laohand.com/markdown.html https://laohand.com/markdown.html Essential Markdown syntax for documentation writing. Organized by functionality from headings to tables. Reference directly when writing READMEs and docs. · Sections: Heading, Text Style, List · e.g. # H1, ## H2, ### H3 Tue, 21 Jul 2026 00:00:00 GMT reference https://laohand.com/http-status-codes.html https://laohand.com/http-status-codes.html All essential HTTP Status Codes commands organized by use case, with 38+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: 1xx Informational, 2xx Success, 3xx Redirection · e.g. 100 Continue, 101 Switching Protocols, 200 OK Tue, 21 Jul 2026 00:00:00 GMT reference https://laohand.com/regex-syntax.html https://laohand.com/regex-syntax.html Essential regex syntax at your fingertips. Organized by functionality from metacharacters to assertions. Reference directly when writing regex patterns. · Sections: Character Class, Quantifier, Anchor & Alternation · e.g. ., \d \D, \w \W Tue, 21 Jul 2026 00:00:00 GMT reference https://laohand.com/ini.html https://laohand.com/ini.html All essential INI commands organized by use case, with 52+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Basic Syntax, Data Types, Common Applications · e.g. ; this is a comment, # this is also a comment, [section] Tue, 21 Jul 2026 00:00:00 GMT ini https://laohand.com/toml.html https://laohand.com/toml.html All essential TOML commands organized by use case, with 38+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Basic Types, Date & Time, Strings · e.g. # this is a comment, key = "value", key = 'value' Tue, 21 Jul 2026 00:00:00 GMT toml https://laohand.com/json.html https://laohand.com/json.html JSON syntax on one page. Reference when writing config files and API data. · Sections: Data Types, Object, Array · e.g. "string", 123 / -456 / 3.14, true / false Tue, 21 Jul 2026 00:00:00 GMT json https://laohand.com/yaml.html https://laohand.com/yaml.html All essential YAML commands organized by use case, with 54+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Basic Syntax, Data Types, List / Array · e.g. key: value, # comment, --- Tue, 21 Jul 2026 00:00:00 GMT yaml https://laohand.com/vite.html https://laohand.com/vite.html Essential Vite build tool commands for the complete workflow from project creation to production build. Copy directly for your projects. · Sections: Project Creation & Init, Dev Server, Production Build · e.g. npm create vite@latest, npm create vite@latest my-app -- --template react-ts, npm create vite@latest my-app -- --template vanilla-ts Tue, 21 Jul 2026 00:00:00 GMT devtools https://laohand.com/jest.html https://laohand.com/jest.html All essential Jest commands organized by use case, with 44+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Basic Tests, Matchers, Async Tests · e.g. test("desc", () => { expect(1 + 2).toBe(3) }), it("desc", fn), describe("module", () => { it(...) }) Tue, 21 Jul 2026 00:00:00 GMT node https://laohand.com/webpack.html https://laohand.com/webpack.html All essential Webpack commands organized by use case, with 45+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Entry & Output, Loaders, Plugins · e.g. entry: "./src/index.js", entry: { app: "./src/app.js", vendor: "./src/vendor.js" }, output.filename: "[name].[contenthash].js" Tue, 21 Jul 2026 00:00:00 GMT node https://laohand.com/npm.html https://laohand.com/npm.html All essential npm commands organized by use case, with 41+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Project Init, Install & Uninstall, Version Management · e.g. npm init -y, npm init, npm init <initializer> [args] Tue, 21 Jul 2026 00:00:00 GMT node https://laohand.com/gitlab.html https://laohand.com/gitlab.html All essential GitLab commands organized by use case, with 51+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Global Navigation, Repository Browsing, Code Browsing · e.g. G then D, G then A, G then M Tue, 21 Jul 2026 00:00:00 GMT devtools https://laohand.com/github.html https://laohand.com/github.html All essential GitHub commands organized by use case, with 50+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Global Navigation, Repository Browsing, Code Browsing · e.g. G then N, G then I, G then P Tue, 21 Jul 2026 00:00:00 GMT devtools https://laohand.com/android-studio.html https://laohand.com/android-studio.html All essential Android Studio commands organized by use case, with 52+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Kotlin/Java Development, Layout Editor, Gradle Build · e.g. Cmd + N, Cmd + Option + T, Cmd + Option + M Tue, 21 Jul 2026 00:00:00 GMT devtools https://laohand.com/phpstorm.html https://laohand.com/phpstorm.html All essential PhpStorm commands organized by use case, with 47+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: PHP-specific, Laravel-specific, Database Tools · e.g. Cmd + N, Cmd + Option + T, Cmd + Option + M Tue, 21 Jul 2026 00:00:00 GMT devtools https://laohand.com/webstorm.html https://laohand.com/webstorm.html All essential WebStorm commands organized by use case, with 67+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Basic Editing, Completion & Generation, Navigation & Search · e.g. Cmd + D, Cmd + Y, Cmd + Shift + Enter Tue, 21 Jul 2026 00:00:00 GMT devtools https://laohand.com/sublime-text.html https://laohand.com/sublime-text.html All essential Sublime Text commands organized by use case, with 46+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Basic Editing, Multi-cursor Editing, Navigation & Selection · e.g. Cmd + D, Cmd + Shift + D, Cmd + Shift + K Tue, 21 Jul 2026 00:00:00 GMT devtools https://laohand.com/intellij-idea.html https://laohand.com/intellij-idea.html All essential IntelliJ IDEA commands organized by use case, with 55+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Code Navigation, Editing & Refactoring, Code Completion · e.g. Cmd+O, Cmd+Shift+O, Cmd+Alt+L Tue, 21 Jul 2026 00:00:00 GMT intellij-idea https://laohand.com/figma.html https://laohand.com/figma.html All essential Figma commands organized by use case, with 50+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Tool Switching, Layer Operations, Align & Distribute · e.g. V, F, R Tue, 21 Jul 2026 00:00:00 GMT figma https://laohand.com/chrome-devtools.html https://laohand.com/chrome-devtools.html All essential Chrome DevTools commands organized by use case, with 54+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Shortcuts, Console Commands, Elements Debugging · e.g. F12 or Cmd+Option+I, F12 or Ctrl+Shift+I, Cmd+Option+J Tue, 21 Jul 2026 00:00:00 GMT chrome-devtools https://laohand.com/postman.html https://laohand.com/postman.html All essential Postman commands organized by use case, with 35+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Request Building, Environment Variables, Test Scripts · e.g. GET {{base_url}}/api/users, POST {{base_url}}/api/users, PUT {{base_url}}/api/users/1 Tue, 21 Jul 2026 00:00:00 GMT postman https://laohand.com/mitmproxy.html https://laohand.com/mitmproxy.html All essential mitmproxy commands organized by use case, with 37+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Startup & Modes, Filter Expressions, Interactive Operations · e.g. mitmproxy, mitmweb, mitmdump Tue, 21 Jul 2026 00:00:00 GMT mitmproxy https://laohand.com/xpath.html https://laohand.com/xpath.html All essential XPath commands organized by use case, with 34+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Basic Paths, Predicate Filtering, Axes · e.g. /, //, . Tue, 21 Jul 2026 00:00:00 GMT xpath https://laohand.com/homebrew.html https://laohand.com/homebrew.html All essential Homebrew commands organized by use case, with 38+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Basics, Cask GUI Apps, Services · e.g. brew install wget, brew uninstall wget, brew update Tue, 21 Jul 2026 00:00:00 GMT homebrew https://laohand.com/pandoc.html https://laohand.com/pandoc.html All essential Pandoc commands organized by use case, with 38+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Basic Conversion, PDF Advanced Options, Templates & Styles · e.g. pandoc input.md -o output.html, pandoc input.md -o output.pdf, pandoc input.md -o output.docx Tue, 21 Jul 2026 00:00:00 GMT pandoc https://laohand.com/chatgpt.html https://laohand.com/chatgpt.html All essential ChatGPT commands organized by use case, with 35+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Prompting, Code, Writing · e.g. You are a senior Python engineer..., Act as a product manager with 10 years of experience..., Complete the following task step by step:... Tue, 21 Jul 2026 00:00:00 GMT chatgpt https://laohand.com/emacs.html https://laohand.com/emacs.html All essential Emacs commands organized by use case, with 48+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Files & Buffers, Cursor Movement, Editing · e.g. C-x C-f, C-x C-s, C-x C-w Tue, 21 Jul 2026 00:00:00 GMT emacs https://laohand.com/vscode.html https://laohand.com/vscode.html All essential VSCode commands organized by use case, with 44+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: General, Editing, Navigation · e.g. Cmd+Shift+P, Ctrl+Shift+P, Cmd+P Tue, 21 Jul 2026 00:00:00 GMT vscode https://laohand.com/pm2.html https://laohand.com/pm2.html All essential PM2 commands organized by use case, with 38+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Start & Stop, Logs, Monitor & Status · e.g. pm2 start app.js, pm2 start app.js --name "api", pm2 start app.js -i max Tue, 21 Jul 2026 00:00:00 GMT node https://laohand.com/ruby.html https://laohand.com/ruby.html Essential Ruby syntax for daily development, organized by category from basics to advanced features like blocks, modules, and metaprogramming. Copy directly when coding. · Sections: Basics, Array & Hash, Control Flow · e.g. name = "Ruby", name = "Hello, #{name}", :symbol Tue, 21 Jul 2026 00:00:00 GMT ruby https://laohand.com/moment.html https://laohand.com/moment.html All essential Moment.js commands organized by use case, with 39+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Creating Dates, Formatting, Manipulating Dates · e.g. moment(), moment("2024-01-15"), moment("2024-01-15", "YYYY-MM-DD") Tue, 21 Jul 2026 00:00:00 GMT javascript https://laohand.com/sinon.html https://laohand.com/sinon.html All essential Sinon commands organized by use case, with 46+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Spy, Stub, Mock · e.g. sinon.spy(obj, "method"), sinon.spy(fn), spy.calledOnce Tue, 21 Jul 2026 00:00:00 GMT javascript https://laohand.com/chai.html https://laohand.com/chai.html All essential Chai commands organized by use case, with 44+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Expect Style (BDD), Should Style (BDD), Assert Style (TDD) · e.g. expect(value).to.equal(expected), expect(value).to.be.a("string"), expect(array).to.include(item) Tue, 21 Jul 2026 00:00:00 GMT javascript https://laohand.com/react-router.html https://laohand.com/react-router.html All essential React Router commands organized by use case, with 36+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Router Setup, Navigation, Route Params · e.g. <BrowserRouter><App /></BrowserRouter>, <Routes><Route path="/" element={<Home />} /></Routes>, <Route path="/users/:id" element={<User />} /> Tue, 21 Jul 2026 00:00:00 GMT javascript https://laohand.com/redux.html https://laohand.com/redux.html All essential Redux commands organized by use case, with 37+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Store Setup, Slice Creation, Actions & Dispatch · e.g. const store = configureStore({ reducer: rootReducer }), configureStore({ reducer: { users: usersReducer, posts: postsReducer } }), configureStore({ middleware: (gdm) => gdm().concat(logger) }) Tue, 21 Jul 2026 00:00:00 GMT javascript https://laohand.com/promise.html https://laohand.com/promise.html All essential Promise commands organized by use case, with 36+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Basics, Consuming Promises, Static Methods · e.g. new Promise((resolve, reject) => { resolve(value) }), new Promise((resolve, reject) => { reject(new Error("fail")) }), Promise.resolve(value) Tue, 21 Jul 2026 00:00:00 GMT javascript https://laohand.com/react.html https://laohand.com/react.html All essential React commands organized by use case, with 39+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Core Hooks, Advanced Hooks, Component Patterns · e.g. const [count, setCount] = useState(0), const [user, setUser] = useState({ name: "", age: 0 }), useEffect(() => { fetchData() }, []) Tue, 21 Jul 2026 00:00:00 GMT node https://laohand.com/vue.html https://laohand.com/vue.html All essential Vue.js commands organized by use case, with 46+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Reactivity Basics, Lifecycle Hooks, Component Communication · e.g. const count = ref(0), count.value++, const state = reactive({ name: "Vue" }) Tue, 21 Jul 2026 00:00:00 GMT node https://laohand.com/lodash.html https://laohand.com/lodash.html All essential Lodash commands organized by use case, with 44+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Array, Object, String · e.g. _.map(arr, (n) => n * 2), _.filter(arr, (n) => n > 0), _.reduce(arr, (sum, n) => sum + n, 0) Tue, 21 Jul 2026 00:00:00 GMT node https://laohand.com/typescript.html https://laohand.com/typescript.html All the TypeScript types and syntax you need for daily development — from basic types to advanced generics, organized by category, ready to copy into your code. · Sections: Basic Types, Interfaces & Types, Generics · e.g. let name: string = "John", let age: number = 30, let isActive: boolean = true Tue, 21 Jul 2026 00:00:00 GMT node https://laohand.com/matlab.html https://laohand.com/matlab.html All essential MATLAB commands organized by use case, with 83+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Matrix Creation, Matrix Operations, Data Visualization · e.g. A = [1 2 3; 4 5 6; 7 8 9], B = [1; 2; 3], C = [1, 2, 3] Tue, 21 Jul 2026 00:00:00 GMT language https://laohand.com/ejs.html https://laohand.com/ejs.html All essential EJS commands organized by use case, with 35+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Basic Syntax, Conditionals, Loops · e.g. <% code %>, <%= value %>, <%- value %> Tue, 21 Jul 2026 00:00:00 GMT language https://laohand.com/dart.html https://laohand.com/dart.html All essential Dart commands organized by use case, with 43+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Variables & Types, Functions & Closures, Classes & Mixins · e.g. var name = 'Dart';, String name = 'Dart';, final name = 'Dart'; Tue, 21 Jul 2026 00:00:00 GMT dart https://laohand.com/csharp.html https://laohand.com/csharp.html All essential C# commands organized by use case, with 39+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Classes & Interfaces, Properties & Methods, LINQ Queries · e.g. public class MyClass { }, public interface IMyInterface { void Method(); }, public class Derived : Base, IMyInterface { } Tue, 21 Jul 2026 00:00:00 GMT csharp https://laohand.com/cpp.html https://laohand.com/cpp.html All essential C++ commands organized by use case, with 44+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Classes & Objects, STL Containers, Smart Pointers · e.g. class MyClass { public: MyClass(); ~MyClass(); };, struct MyStruct { int x; int y; };, MyClass obj; Tue, 21 Jul 2026 00:00:00 GMT cpp https://laohand.com/c.html https://laohand.com/c.html All essential C commands organized by use case, with 58+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Data Types & Variables, Control Flow, Pointers & Arrays · e.g. int x = 10;, float pi = 3.14f;, double e = 2.718; Tue, 21 Jul 2026 00:00:00 GMT c https://laohand.com/graphql.html https://laohand.com/graphql.html All essential GraphQL commands organized by use case, with 42+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Query, Mutation, Subscription · e.g. { user { id name } }, { user(id: 1) { name } }, { users { id name posts { title } } } Tue, 21 Jul 2026 00:00:00 GMT graphql https://laohand.com/jquery.html https://laohand.com/jquery.html All essential jQuery commands organized by use case, with 41+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Selectors, DOM Manipulation, Event Binding · e.g. $("div"), $(".class"), $("#id") Tue, 21 Jul 2026 00:00:00 GMT jquery https://laohand.com/es6.html https://laohand.com/es6.html All essential ES6+ commands organized by use case, with 44+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Variables & Functions, Destructuring, Asynchronous · e.g. let x = 1, const PI = 3.14, const fn = (x) => x * 2 Tue, 21 Jul 2026 00:00:00 GMT es6 https://laohand.com/express.html https://laohand.com/express.html All essential Express.js commands organized by use case, with 45+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: App Setup, Route Definition, Request Object · e.g. const app = express(), app.use(express.json()), app.listen(3000, () => {}) Tue, 21 Jul 2026 00:00:00 GMT express https://laohand.com/laravel.html https://laohand.com/laravel.html All essential Laravel commands organized by use case, with 40+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Project & Dev, Database, Routes & Cache · e.g. laravel new project, php artisan serve, php artisan make:model Post -mcr Tue, 21 Jul 2026 00:00:00 GMT laravel https://laohand.com/swift.html https://laohand.com/swift.html All essential Swift commands organized by use case, with 34+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Compile & Run, Swift Package Manager, Xcode CLI · e.g. swift main.swift, swiftc main.swift -o main, swift main.swiftc Tue, 21 Jul 2026 00:00:00 GMT swift https://laohand.com/kotlin.html https://laohand.com/kotlin.html All essential Kotlin commands organized by use case, with 47+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Compile & Run, Gradle Build, Null Safety · e.g. kotlinc main.kt -include-runtime -d main.jar, java -jar main.jar, kotlinc -script script.kts Tue, 21 Jul 2026 00:00:00 GMT kotlin https://laohand.com/rust.html https://laohand.com/rust.html All essential Rust commands organized by use case, with 51+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Project Management, Dependency Management, Testing & Docs · e.g. cargo new project_name, cargo new --lib project_name, cargo init Tue, 21 Jul 2026 00:00:00 GMT rust https://laohand.com/php.html https://laohand.com/php.html All essential PHP commands organized by use case, with 36+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: CLI Run, Composer Dependency, Extensions & Config · e.g. php script.php, php -a, php -S localhost:8000 Tue, 21 Jul 2026 00:00:00 GMT php https://laohand.com/java.html https://laohand.com/java.html All essential Java commands organized by use case, with 34+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Compile & Run, Maven Commands, Gradle Commands · e.g. javac Main.java, java -cp .:lib.jar Main, java -cp ".;lib.jar" Main Tue, 21 Jul 2026 00:00:00 GMT java https://laohand.com/numpy.html https://laohand.com/numpy.html All essential NumPy commands organized by use case, with 40+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Array Creation, Indexing & Slicing, Shape Manipulation · e.g. np.array([1, 2, 3]), np.zeros((3, 4)), np.ones((2, 3)) Tue, 21 Jul 2026 00:00:00 GMT numpy https://laohand.com/go.html https://laohand.com/go.html All essential Go commands organized by use case, with 44+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Variables & Constants, Control Flow, Functions · e.g. var name string = "value", name := "value", const Pi = 3.14 Tue, 21 Jul 2026 00:00:00 GMT language https://laohand.com/javascript.html https://laohand.com/javascript.html All the JavaScript ES6+ syntax you need for daily development — from basics to async/await, organized by category, ready to copy into your code. · Sections: Variables & Functions, Destructuring, String & Template · e.g. const name = "value", let count = 0, const fn = (x) => x * 2 Tue, 21 Jul 2026 00:00:00 GMT language https://laohand.com/python.html https://laohand.com/python.html All the Python syntax you need for daily development — from basics to advanced features, organized by category, ready to copy into your code. · Sections: Virtual Environment & Package Management, Data Types, List Comprehension · e.g. python3 -m venv venv, source venv/bin/activate, venv\Scripts\activate Tue, 21 Jul 2026 00:00:00 GMT language https://laohand.com/sqlite.html https://laohand.com/sqlite.html Essential SQLite embedded database commands for the complete workflow from database creation to data import/export. Copy directly for your projects. · Sections: Database Connection & Basics, Table Operations, Data CRUD · e.g. sqlite3 file.db, .open file.db, .databases Tue, 21 Jul 2026 00:00:00 GMT database https://laohand.com/knex.html https://laohand.com/knex.html All essential Knex.js commands organized by use case, with 50+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Query Data, Insert Data, Update & Delete · e.g. knex("users").select("*"), knex("users").select("name", "email"), knex("users").where("age", ">", 18) Tue, 21 Jul 2026 00:00:00 GMT database https://laohand.com/sql-join.html https://laohand.com/sql-join.html All essential SQL JOIN commands organized by use case, with 41+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: INNER JOIN, LEFT / RIGHT JOIN, FULL / CROSS JOIN · e.g. SELECT * FROM users INNER JOIN orders ON users.id = orders.user_id, SELECT u.name, o.total FROM users u JOIN orders o ON u.id = o.user_id, SELECT u.name, o.total FROM users u JOIN orders o ON u.id = o.user_id AND o.status = 'paid' Tue, 21 Jul 2026 00:00:00 GMT database https://laohand.com/neo4j.html https://laohand.com/neo4j.html All essential Neo4j Cypher commands organized by use case, with 40+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Create Nodes & Relationships, Query & Match, WITH & Subqueries · e.g. CREATE (n:Person {name: "Alice"}), CREATE (a:Person)-[:KNOWS]->(b:Person), CREATE (a:Person {name: "Alice"})-[:KNOWS {since: 2020}]->(b:Person {name: "Bob"}) Tue, 21 Jul 2026 00:00:00 GMT neo4j https://laohand.com/mongodb.html https://laohand.com/mongodb.html All essential MongoDB commands organized by use case, with 43+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Database, Document CRUD, Query Operators · e.g. show dbs, use dbname, db Tue, 21 Jul 2026 00:00:00 GMT database https://laohand.com/redis.html https://laohand.com/redis.html Essential Redis commands for daily cache administration and development. Organized by scenario from data structure operations to memory troubleshooting. Copy and use directly during troubleshooting. · Sections: Connection, Data Structure, Key Space · e.g. redis-cli -h 127.0.0.1 -p 6379 -a password, redis-cli --scan --pattern "user:*", redis-cli -r 5 -i 1 INFO memory Tue, 21 Jul 2026 00:00:00 GMT redis https://laohand.com/postgresql.html https://laohand.com/postgresql.html Essential PostgreSQL commands for daily database administration and development. Organized by scenario from table creation to query optimization. Copy and use directly during troubleshooting. · Sections: Connection & Role, Database & Table, Query Analysis · e.g. psql -U postgres -h 127.0.0.1 -p 5432, psql -U postgres -d db_name -c "\dt", CREATE ROLE app_user WITH LOGIN PASSWORD 'secret'; Tue, 21 Jul 2026 00:00:00 GMT database https://laohand.com/mysql.html https://laohand.com/mysql.html Essential MySQL commands for daily database administration and development. Organized by scenario from table creation to query optimization. Copy and use directly during troubleshooting. · Sections: Connection & User, Database & Table, Query & Index · e.g. mysql -u root -p -h 127.0.0.1 -P 3306, mysql -u root -p db_name < dump.sql, mysqldump -u root -p --single-transaction db_name > backup.sql Tue, 21 Jul 2026 00:00:00 GMT database https://laohand.com/elasticsearch-commands.html https://laohand.com/elasticsearch-commands.html All essential Elasticsearch commands organized by use case, with 40+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Cluster Status, Shard & Index, Document CRUD · e.g. curl localhost:9200/_cluster/health?pretty, curl localhost:9200/_cat/nodes?v, curl localhost:9200/_cat/health?v Tue, 21 Jul 2026 00:00:00 GMT search https://laohand.com/svelte.html https://laohand.com/svelte.html Essential Svelte compiled frontend framework syntax from reactivity to component communication, Store to animations. Organized by category, copy directly when coding. · Sections: Template Syntax, Reactive Declarations, Components & Props · e.g. { expression }, {@html rawHtmlString}, {#if condition}...{:else if}...{:else}...{/if} Tue, 21 Jul 2026 00:00:00 GMT frontend https://laohand.com/nextjs.html https://laohand.com/nextjs.html Essential Next.js full-stack React framework APIs from routing to data fetching, rendering strategies to middleware. Organized by category, copy directly when coding. · Sections: App Router Basics, Routing & Navigation, Data Fetching · e.g. app/page.tsx, app/layout.tsx, app/loading.tsx Tue, 21 Jul 2026 00:00:00 GMT frontend https://laohand.com/tailwind-css.html https://laohand.com/tailwind-css.html Essential Tailwind CSS utility classes for atomic CSS, organized by function from layout to colors, responsive design to animations. Copy directly when building pages. · Sections: Layout, Flexbox, Grid · e.g. container, block / inline-block / inline, hidden Tue, 21 Jul 2026 00:00:00 GMT frontend https://laohand.com/html-meta.html https://laohand.com/html-meta.html All essential HTML Meta Tags commands organized by use case, with 36+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Document Metadata, SEO, Social Sharing (Open Graph + Twitter) · e.g. <meta charset="UTF-8">, <meta name="viewport" content="width=device-width, initial-scale=1">, <meta name="description" content="Page description"> Tue, 21 Jul 2026 00:00:00 GMT frontend https://laohand.com/css-grid.html https://laohand.com/css-grid.html All essential CSS Grid commands organized by use case, with 42+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Container Definition, Gap & Alignment, Cells & Spans · e.g. display: grid, display: inline-grid, grid-template-columns: 1fr 2fr 1fr Tue, 21 Jul 2026 00:00:00 GMT frontend https://laohand.com/css-flexbox.html https://laohand.com/css-flexbox.html All essential CSS Flexbox commands organized by use case, with 44+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Container Properties, Gap & Main-axis Alignment, Cross-axis Alignment · e.g. display: flex, display: inline-flex, flex-direction: row Tue, 21 Jul 2026 00:00:00 GMT frontend https://laohand.com/sass.html https://laohand.com/sass.html All essential Sass/SCSS commands organized by use case, with 40+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Variables & Operations, Maps & Color Functions, Nesting · e.g. $primary: #6366f1, color: $primary, $primary: #6366f1 !default Tue, 21 Jul 2026 00:00:00 GMT sass https://laohand.com/emmet.html https://laohand.com/emmet.html All essential Emmet commands organized by use case, with 39+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: HTML Basics, Common HTML Structures, CSS Shorthand · e.g. ! or html:5, div#app, div.container Tue, 21 Jul 2026 00:00:00 GMT emmet https://laohand.com/css3.html https://laohand.com/css3.html All essential CSS3 commands organized by use case, with 59+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Selectors, Box Model, Layout · e.g. .class, #id, div p Tue, 21 Jul 2026 00:00:00 GMT frontend https://laohand.com/html.html https://laohand.com/html.html All essential HTML commands organized by use case, with 52+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Document Structure, Text Formatting, Lists · e.g. <!DOCTYPE html>, <html lang="zh-CN">, <head>...</head> Tue, 21 Jul 2026 00:00:00 GMT frontend https://laohand.com/ssh.html https://laohand.com/ssh.html Essential SSH commands organized by Login & Auth, Key Management, Config File, and Port Forwarding. Reference directly for passwordless login and tunneling. · Sections: Connection & Auth, Key Management, Config File ~/.ssh/config · e.g. ssh user@host, ssh -p 2222 user@host, ssh -i ~/.ssh/id_ed25519 user@host Tue, 21 Jul 2026 00:00:00 GMT linux https://laohand.com/curl.html https://laohand.com/curl.html Essential curl commands organized by Basic Requests, Debugging, Proxy & Timeout, and Auth & Upload. Reference directly when debugging APIs or verifying packets. · Sections: Basic Requests, Debugging & Details, Proxy & Timeout · e.g. curl https://example.com, curl -X POST https://api.example.com, curl -H "Content-Type: application/json" -H "Authorization: Bearer xxx" https://api.example.com Tue, 21 Jul 2026 00:00:00 GMT curl https://laohand.com/nginx.html https://laohand.com/nginx.html Essential Nginx commands for config testing, location matching, reverse proxy, and log troubleshooting. Reference directly when editing configs or debugging 502 errors. · Sections: Commands & Testing, Location Matching Priority, Reverse Proxy Snippets · e.g. nginx -t, nginx -s reload, nginx -T Tue, 21 Jul 2026 00:00:00 GMT nginx https://laohand.com/powershell.html https://laohand.com/powershell.html Essential PowerShell commands for Windows system administration and automation, organized by scenario from file operations to remote management. Copy directly. · Sections: Basic Commands, File & Directory, Content Operations · e.g. Get-Command, Get-Help Get-Process, Get-Member Tue, 21 Jul 2026 00:00:00 GMT sysops https://laohand.com/terraform.html https://laohand.com/terraform.html Essential Terraform IaC commands for the complete lifecycle from init to destroy, organized by scenario. Copy directly for your infrastructure. · Sections: Core Workflow, State Management, Variables & Outputs · e.g. terraform init, terraform plan, terraform apply Tue, 21 Jul 2026 00:00:00 GMT cicd https://laohand.com/cron.html https://laohand.com/cron.html All essential cron commands organized by use case, with 43+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Schedule Format, Special Strings, System Cron · e.g. * * * * * command, */15 * * * *, 0 */2 * * * Tue, 21 Jul 2026 00:00:00 GMT linux https://laohand.com/rclone.html https://laohand.com/rclone.html All essential rclone commands organized by use case, with 35+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Config & Connect, Browse & List, Sync & Copy · e.g. rclone config, rclone config show, rclone listremotes Tue, 21 Jul 2026 00:00:00 GMT linux https://laohand.com/fish-shell.html https://laohand.com/fish-shell.html All essential Fish Shell commands organized by use case, with 36+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Variables & Scope, Control Flow, Functions & Aliases · e.g. set name "John", echo $name, set -x PATH /usr/local/bin $PATH Tue, 21 Jul 2026 00:00:00 GMT linux https://laohand.com/vagrant.html https://laohand.com/vagrant.html All essential Vagrant commands organized by use case, with 40+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: VM Lifecycle, Box Management, Vagrantfile · e.g. vagrant init ubuntu/jammy64, vagrant up, vagrant ssh Tue, 21 Jul 2026 00:00:00 GMT linux https://laohand.com/ansible.html https://laohand.com/ansible.html All essential Ansible commands organized by use case, with 42+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Core Commands, Ad-hoc Commands, Common Modules · e.g. ansible all -m ping, ansible-playbook site.yml, ansible-galaxy init myrole Tue, 21 Jul 2026 00:00:00 GMT linux https://laohand.com/gnupg.html https://laohand.com/gnupg.html All essential GnuPG commands organized by use case, with 37+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Key Generation, Import & Export, Encrypt & Decrypt · e.g. gpg --full-generate-key, gpg --quick-generate-key "Name <email>", gpg --list-keys Tue, 21 Jul 2026 00:00:00 GMT linux https://laohand.com/zsh.html https://laohand.com/zsh.html All essential Zsh commands organized by use case, with 37+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Basic Setup, Variables & Arrays, Globbing & Expansion · e.g. chsh -s $(which zsh), source ~/.zshrc, echo $SHELL Tue, 21 Jul 2026 00:00:00 GMT linux https://laohand.com/ffmpeg.html https://laohand.com/ffmpeg.html All essential FFmpeg commands organized by use case, with 39+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Format Conversion, Trim & Crop, Extract & Separate · e.g. ffmpeg -i input.mp4 output.avi, ffmpeg -i input.mp4 -c:v libx264 output.mp4, ffmpeg -i input.mp4 -c:v libx265 output.mp4 Tue, 21 Jul 2026 00:00:00 GMT linux https://laohand.com/taskset.html https://laohand.com/taskset.html All essential taskset commands organized by use case, with 37+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Basic Usage, CPU Mask & List Format, Pin Running Processes · e.g. taskset -p <pid>, taskset -c -p <pid>, taskset -c 0,1 <command> Tue, 21 Jul 2026 00:00:00 GMT taskset https://laohand.com/netcat.html https://laohand.com/netcat.html All essential netcat commands organized by use case, with 36+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Connectivity Test & Port Scan, File & Data Transfer, Port Listening · e.g. nc -zv host 80, nc -zv host 80 443 8080, nc -zv host 1-1000 Tue, 21 Jul 2026 00:00:00 GMT netcat https://laohand.com/scp-rsync.html https://laohand.com/scp-rsync.html All essential SCP & Rsync commands organized by use case, with 39+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: scp Basics, rsync Basics, rsync Incremental · e.g. scp file user@host:/path, scp user@host:/path/file ., scp -r dir user@host:/path Tue, 21 Jul 2026 00:00:00 GMT linux https://laohand.com/wget.html https://laohand.com/wget.html All essential wget commands organized by use case, with 38+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Basic Download, Resume, Recursive · e.g. wget URL, wget -O filename URL, wget -P /path/to/dir URL Tue, 21 Jul 2026 00:00:00 GMT linux https://laohand.com/top.html https://laohand.com/top.html All essential top commands organized by use case, with 52+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: top Basics, top Interactive, top Sort & Display · e.g. top, top -d 5, top -p 1234 Tue, 21 Jul 2026 00:00:00 GMT linux https://laohand.com/ps.html https://laohand.com/ps.html All essential ps commands organized by use case, with 35+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Basic View, Filter, Custom Format · e.g. ps, ps aux, ps -ef Tue, 21 Jul 2026 00:00:00 GMT linux https://laohand.com/grep.html https://laohand.com/grep.html All essential grep commands organized by use case, with 38+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Basic Search, Recursive, Regular Expression · e.g. grep "pattern" file, grep -i "pattern" file, grep -v "pattern" file Tue, 21 Jul 2026 00:00:00 GMT linux https://laohand.com/sed.html https://laohand.com/sed.html All essential sed commands organized by use case, with 37+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Substitute, Delete, Insert & Append · e.g. sed 's/old/new/' file, sed 's/old/new/g' file, sed 's/old/new/2' file Tue, 21 Jul 2026 00:00:00 GMT linux https://laohand.com/awk.html https://laohand.com/awk.html All essential awk commands organized by use case, with 37+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Basic Syntax, Built-in Variables, Conditionals · e.g. awk '{print $1}' file, awk -F: '{print $1, $3}' /etc/passwd, awk '{print $1, $NF}' file Tue, 21 Jul 2026 00:00:00 GMT linux https://laohand.com/screen.html https://laohand.com/screen.html All essential screen commands organized by use case, with 38+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Session Management, Windows, Split Screen · e.g. screen -S name, screen -ls, screen -r name Tue, 21 Jul 2026 00:00:00 GMT linux https://laohand.com/netstat.html https://laohand.com/netstat.html All essential netstat commands organized by use case, with 39+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: View Connections, Listening Ports, Routing Table & Interface Stats · e.g. netstat, netstat -a, netstat -at Tue, 21 Jul 2026 00:00:00 GMT network https://laohand.com/lsof.html https://laohand.com/lsof.html All essential lsof commands organized by use case, with 35+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: By Process, By Port, By File · e.g. lsof -p 1234, lsof -c nginx, lsof -c /^nginx/ Tue, 21 Jul 2026 00:00:00 GMT linux https://laohand.com/find.html https://laohand.com/find.html All essential find commands organized by use case, with 37+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: By Name, By Type, By Size · e.g. find . -name "file.txt", find . -iname "file.txt", find . -name "*.log" Tue, 21 Jul 2026 00:00:00 GMT linux https://laohand.com/chmod.html https://laohand.com/chmod.html All essential chmod commands organized by use case, with 37+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Permission Bits, Numeric Mode, Symbolic Mode · e.g. r (read), w (write), x (execute) Tue, 21 Jul 2026 00:00:00 GMT sysops https://laohand.com/bash.html https://laohand.com/bash.html Essential Bash scripting syntax on one page. Variables, loops, functions, and string operations — reference directly when writing shell scripts. · Sections: Variables, Conditionals, Loops · e.g. NAME="value", echo $NAME, echo ${NAME} Tue, 21 Jul 2026 00:00:00 GMT linux https://laohand.com/openssl.html https://laohand.com/openssl.html All essential OpenSSL commands organized by use case, with 33+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Inspect Certificate, Remote Check, Generate Certificate · e.g. openssl x509 -in cert.pem -text -noout, openssl x509 -in cert.pem -dates -noout, openssl x509 -in cert.pem -issuer -noout Tue, 21 Jul 2026 00:00:00 GMT security https://laohand.com/tar-compress.html https://laohand.com/tar-compress.html All essential tar commands organized by use case, with 44+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Pack & Compress, Extract, List & Test · e.g. tar -cvf archive.tar dir/, tar -czvf archive.tar.gz dir/, tar -cjvf archive.tar.bz2 dir/ Tue, 21 Jul 2026 00:00:00 GMT archive https://laohand.com/text-processing.html https://laohand.com/text-processing.html All essential sed/awk/grep commands organized by use case, with 52+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: grep Match & Search, sed Replace & Edit, awk Extract & Summarize · e.g. grep "error" app.log, grep -i "error" app.log, grep -rn "TODO" src/ Tue, 21 Jul 2026 00:00:00 GMT linux https://laohand.com/tmux.html https://laohand.com/tmux.html Essential tmux commands for remote development. Organized by session, window, pane, copy mode, and configuration — keep sessions alive when connections drop. · Sections: Session, Window, Pane · e.g. tmux new -s mywork, tmux ls, tmux attach -t mywork Tue, 21 Jul 2026 00:00:00 GMT linux https://laohand.com/mq-commands.html https://laohand.com/mq-commands.html All essential MQ commands organized by use case, with 32+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Kafka, RabbitMQ, RocketMQ · e.g. kafka-consumer-groups.sh --bootstrap-server :9092 --list, kafka-consumer-groups.sh --describe --group <group>, kafka-topics.sh --describe --topic <topic> Tue, 21 Jul 2026 00:00:00 GMT mq https://laohand.com/cicd-commands.html https://laohand.com/cicd-commands.html All essential CI/CD commands organized by use case, with 33+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: GitHub Actions, GitLab CI, Jenkins · e.g. gh run list --limit 10, gh run view <run-id> --log-failed, gh run rerun <run-id> --failed Tue, 21 Jul 2026 00:00:00 GMT cicd https://laohand.com/crontab.html https://laohand.com/crontab.html All essential Cron commands organized by use case, with 43+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Expression Format, Special Characters, Special Time Macros · e.g. * * * * * command, Minute (0-59), Hour (0-23) Tue, 21 Jul 2026 00:00:00 GMT linux https://laohand.com/systemd.html https://laohand.com/systemd.html All essential Systemd commands organized by use case, with 47+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Service Management, Status, journalctl · e.g. systemctl start nginx, systemctl stop nginx, systemctl restart nginx Tue, 21 Jul 2026 00:00:00 GMT linux https://laohand.com/vim.html https://laohand.com/vim.html Essential Vim commands for editing configs on a server. Organized by motion, edit, search, visual mode, and save/exit — just copy and use when stuck. · Sections: Motion, Edit, Search · e.g. gg / G, 0 / $, w / b Tue, 21 Jul 2026 00:00:00 GMT linux https://laohand.com/linux-troubleshoot.html https://laohand.com/linux-troubleshoot.html Essential Linux troubleshooting commands covering CPU, memory, disk, and network. Organized by scenario for on-site diagnosis — just copy and use. · Sections: Process & Load, Port & Network, Disk & Memory · e.g. top -c, ps aux --sort=-%cpu | head, ps aux --sort=-%mem | head Tue, 21 Jul 2026 00:00:00 GMT linux https://laohand.com/git-log.html https://laohand.com/git-log.html All essential Git Log commands organized by use case, with 48+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Formatting Output, Filtering, Statistics & Analysis · e.g. git log --oneline, git log -n 10, git log --pretty=format:"%h %s" Tue, 21 Jul 2026 00:00:00 GMT git https://laohand.com/git-branch.html https://laohand.com/git-branch.html Git branches are the core of team collaboration. All essential branch operation commands organized by Create & Switch, Merge & Rebase, Remote Branches, and Cleanup for managing multi-branch development workflows. · Sections: Create & Switch, Merge & Rebase, Remote Branches · e.g. git branch feature/login, git checkout feature/login, git checkout -b feature/login Tue, 21 Jul 2026 00:00:00 GMT git https://laohand.com/git.html https://laohand.com/git.html All essential Git commands organized by Commit, Branch, Revert, Remote, and Diagnostics. Find solutions when you mess up a commit or branch. · Sections: Commit & Stash, Branch & Merge, Revert & Undo · e.g. git status -s, git add -p, git commit -m "msg" Tue, 21 Jul 2026 00:00:00 GMT git https://laohand.com/dockerfile.html https://laohand.com/dockerfile.html All essential Dockerfile commands organized by use case, with 38+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Base Instructions, Env & Args, File Operations · e.g. FROM node:18-alpine, FROM scratch, WORKDIR /app Tue, 21 Jul 2026 00:00:00 GMT docker https://laohand.com/docker-compose.html https://laohand.com/docker-compose.html All essential Docker Compose commands for multi-service projects organized by Start/Stop, Logs, Config, and Network & Volume. Reference directly when managing and troubleshooting services. · Sections: Start & Stop, Logs & Status, Config & Build · e.g. docker compose up -d, docker compose up -d --build, docker compose stop Tue, 21 Jul 2026 00:00:00 GMT docker https://laohand.com/kubectl.html https://laohand.com/kubectl.html All essential kubectl commands organized by Query, Describe, Scale, and Context. Step through groups when troubleshooting CrashLoop or connectivity issues. · Sections: Get Resources, Describe & Diagnose, Scale & Rollout · e.g. kubectl get pods -n prod, kubectl get pods -o wide, kubectl get pods -A Tue, 21 Jul 2026 00:00:00 GMT kubernetes https://laohand.com/docker-cli.html https://laohand.com/docker-cli.html All essential Docker commands organized by Image, Container, Network, Volume, Registry, Build Debug, and Compose. Copy and tweak on the spot during troubleshooting. · Sections: Image, Container, Network & Volume · e.g. docker images, docker pull nginx:alpine, docker build -t app:1.0 . Tue, 21 Jul 2026 00:00:00 GMT docker https://laohand.com/rsync.html https://laohand.com/rsync.html All essential rsync commands organized by use case, with 31+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Basic Sync, Transfer Options, Display Options · e.g. rsync -avz ./src /dest, rsync -avz ./src/ /dest, rsync -avz user@host:/remote /local Sun, 19 Jul 2026 00:00:00 GMT linux https://laohand.com/awscli.html https://laohand.com/awscli.html All essential AWS CLI commands organized by use case, with 41+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Configure & Auth, EC2 Instances, S3 Storage · e.g. aws configure, aws configure --profile production, aws configure list Sun, 19 Jul 2026 00:00:00 GMT linux https://laohand.com/httpie.html https://laohand.com/httpie.html All essential HTTPie commands organized by use case, with 37+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Basic Requests, Headers & Params, Auth & Session · e.g. http GET https://api.example.com/users, http https://api.example.com/users, http POST https://api.example.com/users name=John age:=30 Sun, 19 Jul 2026 00:00:00 GMT linux https://laohand.com/makefile.html https://laohand.com/makefile.html All essential Makefile commands organized by use case, with 42+ entries you can copy and run directly. Find the right command fast when you need it. · Sections: Variables & Assignment, Automatic Variables, Rules & Targets · e.g. CC = gcc, CC := gcc, CC ?= gcc Sun, 19 Jul 2026 00:00:00 GMT linux