Cheatsheets

Copy-ready commands, syntax and shortcuts for the work you do every day. Every entry is searchable, copyable in one click, and printable on a single page.

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git-commands · featured git init Initialize a new Git repository git clone <url> Clone a remote repository git config --global user.name "Name" Set your name for all repos git config --global user.email "email" Set your email for all repos git config --list Show all configuration settings

Linux & Terminal Command line, shell scripting, and system administration

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• Linux Commands 61 commands · 8 sections ls -lacd <dir> Essential Linux commands for file management, processes, networking, and system administration
• Bash Scripting 53 commands · 7 sections NAME="value"$NAME or ${NAME} Variables, loops, conditionals, functions, and scripting patterns for Bash shell
• Vim Editor 64 commands · 8 sections ia Vim modes, movement, editing, copy and paste, search, replacement, and file commands.
• SSH Commands 54 commands · 8 sections New ssh user@hostssh user@host -p 2222 SSH connections, key management, SCP/SFTP transfers, tunnels, and security hardening
• Cron Expressions 40 commands · 7 sections New minute hour dom month dow* 5-field crontab syntax, nicknames, common schedules, and systemd OnCalendar traps
• OpenSSL Certificates 31 commands · 7 sections New openssl x509 -in cert.pem -text -nooutopenssl x509 -in cert.pem -noout -subject -issuer -dates Inspect PEM certs, CSRs, and keys, convert formats, verify chains, and probe live TLS

Git & Version Control Git commands, branching strategies, and workflows

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• Git History and Diffs 38 commands · 7 sections New <commit>, <branch>, <file>Read-only reference Inspect Git history, compare revisions, follow file changes, and read reflogs. Check the difference between log ranges and snapshot comparisons.
• Git Branches and Remotes 39 commands · 7 sections New Check the project rulesCommit or preserve your work Create branches, inspect remote tracking, fetch updates, and use fast-forward merges. Check shared-branch rules before publishing changes.
• Gitignore Patterns 40 commands · 7 sections New Untracked files onlyIgnore is not access control Check .gitignore patterns, directory scope, exceptions, and tracked-file limits. Diagnose matching rules with Git check-ignore examples.
• Git Commands 55 commands · 8 sections git initgit clone <url> Common Git commands for setup, commits, branches, merges, history, stashes, and remote operations.

Programming Language syntax, methods, and common patterns

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• Barcode Formats 40 commands · 8 sections New CODE128CODE39 Code 128, Code 39, EAN and UPC inputs, check digits, export settings, and print checks for barcode generation.
• JavaScript ES6+ 59 commands · 9 sections const x = 1let y = 2 Modern JavaScript syntax: destructuring, arrow functions, promises, modules, and built-in methods
• Python Essentials 59 commands · 8 sections x = 10x = 3.14 Python syntax, data structures, comprehensions, built-in functions, and common patterns
• Regular Expressions 44 commands · 8 sections .\d JavaScript-style regex syntax, character classes, quantifiers, groups, assertions, flags, and example shape patterns.
• SQL Reference 43 commands · 7 sections SELECT * FROM tableSELECT col1, col2 FROM table Common SQL clauses for queries, joins, aggregation, data changes, tables, and indexes. Check the database dialect.
• TypeScript Essentials 63 commands · 9 sections New let name: string = "hello"let age: number = 25 Types, interfaces, generics, utility types, type guards, and advanced TypeScript patterns
• NPM Commands 59 commands · 9 sections New npm initnpm init -y Package management: install, update, publish, scripts, audit, and configuration
• Redis Commands 75 commands · 9 sections New redis-cliredis-cli -h host -p 6379 Strings, hashes, lists, sets, sorted sets, pub/sub, streams, and transactions
• MySQL Reference 64 commands · 9 sections New mysql -u root -pmysql -h host -u user -p dbname MySQL queries, joins, indexes, user management, and database administration
• jq Commands 37 commands · 7 sections New jq . file.jsonjq -c . file.json Pretty-print, select, map, and transform JSON on the command line

Web Development HTML, CSS, frameworks, and web standards

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• React Hooks 53 commands · 9 sections New const [value, setValue] = useState(initial)setValue(newValue) useState, useEffect, useRef, useMemo, React 19 hooks, and custom hook patterns
• CSS Flexbox 36 commands · 6 sections display: flexdisplay: inline-flex Flex container and item properties, alignment, ordering, and common layout patterns
• CSS Grid 36 commands · 7 sections display: griddisplay: inline-grid Grid container and item properties, template areas, auto-placement, and responsive grids
• HTTP Status Codes 41 commands · 7 sections 100 Continue101 Switching Protocols Common HTTP status codes and headers for requests, redirects, authentication, caching, and server errors.
• cURL HTTP 36 commands · 7 sections New curl https://example.com/curl -I https://example.com/ GET, POST JSON, headers, auth, redirects, TLS, and useful script flags
• JWT Reference 37 commands · 7 sections New header.payload.signaturetyp Signed JWT claims, algorithms, verification checks, and the distinction between JWS and JWE.

DevOps & Cloud Docker, Kubernetes, CI/CD, and infrastructure

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• Docker Commands 54 commands · 7 sections docker run <image>docker run -d -p 8080:80 <image> Docker CLI, container management, images, volumes, networks, and Docker Compose
• Kubernetes Commands 72 commands · 9 sections New kubectl cluster-infokubectl config view kubectl essentials: pods, deployments, services, secrets, scaling, debugging, and RBAC
• Apache HTTP Server 64 commands · 9 sections New sudo systemctl start apache2sudo systemctl stop apache2 Virtual hosts, modules, SSL, .htaccess, reverse proxy, and performance tuning
• Nginx Server 69 commands · 9 sections New sudo systemctl start nginxsudo systemctl stop nginx Server blocks, reverse proxy, SSL, load balancing, caching, and rate limiting
• AWS CLI 58 commands · 9 sections New aws configureaws configure list S3, EC2, IAM, Lambda, ECS, CloudFormation, and essential AWS CLI commands
• Terraform Commands 59 commands · 9 sections New terraform initterraform plan Infrastructure as Code: init, plan, apply, state management, workspaces, and modules

Student & Academic Study tools, writing, and academic references

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• Percentages and Ratios 37 commands · 7 sections New p% = p / 100Base value Calculate percentage shares, increases, discounts, and ratios. Use worked examples to distinguish percentage points from relative percentage changes.
• Everyday Unit Conversions 37 commands · 7 sections New Match the quantityUS customary units Convert length, area, volume, mass, time, and temperature. Use exact metric and US customary factors with clear unit definitions and examples.
• Markdown Syntax 41 commands · 9 sections # Heading 1## Heading 2 Headings, formatting, links, images, code blocks, tables, and GitHub-flavored markdown

Shortcuts & Productivity Keyboard shortcuts, editor tips, and workflow hacks

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• Spreadsheet Formulas 38 shortcuts · 7 sections New Excel and Google Sheets=SUM(A2:A10) Use basic Excel and Google Sheets formulas for totals, conditions, text, percentages, and rounding. Check references and locale separators.
• Windows 11 Keyboard Shortcuts 39 shortcuts · 7 sections New Windows 11Win Find Windows 11 shortcuts for text, windows, File Explorer, screenshots, and virtual desktops. Check key names and application differences.
• Mac Keyboard Shortcuts 37 shortcuts · 7 sections New Command, Option, Control, ShiftCommand = ⌘; Option = ⌥ Find Mac shortcuts for text, applications, Finder, screenshots, and system tools. Check Command, Option, Control, and Shift key differences.
• Chrome Browser Shortcuts 39 shortcuts · 7 sections New Google Chrome on desktopWindows and Linux: Ctrl Find Chrome tab, navigation, search, and page shortcuts. Use separate Windows, Linux, and Mac key references with links to official documentation.
• Everyday File Formats 38 shortcuts · 7 sections New Renaming is not conversionKeep an editable original Compare document, spreadsheet, image, archive, audio, and video formats. Check conversion limits and choose a format for sharing or editing.
• VS Code Shortcuts 55 shortcuts · 8 sections Ctrl+Shift+P / Cmd+Shift+PCtrl+P / Cmd+P VS Code keyboard shortcuts for editing, navigation, search, terminals, debugging, and panel layout.

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