Cheatsheets for popular tools and technologies

awk is a pattern-scanning and text-processing language for extracting, filtering, and summarizing structured text, with field, pattern, and BEGIN/END examples.

Updated 2026-09-22

Bash is a Unix shell and scripting language used to automate command-line tasks. This cheatsheet covers practical Bash scripting syntax for variables, tests, loops, functions, arguments, redirection, and more.

Updated 2026-06-21

Cargo is the Rust package manager and build system that helps manage dependencies, compile projects, run tests, and generate documentation for Rust projects. Cargo-deny helps audit and manage dependency licenses and security advisories.

Updated 2026-09-25

chmod changes Unix file modes and chown changes file ownership. This cheatsheet covers symbolic and numeric permissions, common modes, recursive changes, special bits, and umask.

Updated 2026-06-21

Crontab cheat sheet: field syntax (minute hour day-of-month month day-of-week), special strings, common schedule examples, and crontab -e/-l/-r commands.

Updated 2026-09-27

CSS is the stylesheet language used to style HTML documents with selectors, properties, layout rules, and visual effects.

Updated 2023-02-28

curl is a command-line HTTP client for sending requests, downloading files, and debugging APIs, with headers/methods/auth/download examples.

Updated 2026-09-23

Docker is a platform designed to help developers build, share, and run applications in containers. Containers provide a lightweight, isolated environment for applications.

Updated 2024-08-15

Docker Compose cheat sheet: define and run multi-container apps from a compose.yml file, with up/down/logs/exec commands, compose file syntax, override files, and profiles.

Updated 2026-09-26

du cheat sheet with a GNU coreutils --max-depth reference: exact semantics, --max-depth vs -d vs -s, and copy-pasteable commands for disk usage, sorting, and excluding paths.

Updated 2026-09-18

Free FFmpeg cheat sheet with copy-pasteable commands for converting, resizing, trimming, compressing, and extracting audio from video — the syntax you'll actually reach for.

Updated 2026-08-31

find searches directory trees using file names, types, sizes, timestamps, permissions, and other criteria. This cheatsheet covers common find expressions and safe actions.

Updated 2026-06-21

A cheatsheet for identifying what processes are listening on specific ports on Mac and Linux, covering netstat, ss, lsof, and fuser with per-OS variants.

Updated 2026-09-20

Git is a distributed version control system that helps manage source code history, branches, and collaboration in software projects. This cheatsheet covers essential Git commands for everyday use.

Updated 2024-10-10

GNU Screen cheat sheet: start/detach/reattach sessions, recover a session stuck attached elsewhere, use scrollback/copy mode, and manage windows in this terminal multiplexer.

Updated 2026-09-19

Go (Golang) cheat sheet with common syntax for variables, control flow, slices, maps, structs, interfaces, goroutines, channels, errors, and JSON.

Updated 2026-08-15

GraphQL is a typed API query language for requesting exactly the fields a client needs and describing data with a schema, with query/mutation/subscription/variables examples.

Updated 2026-09-23

Cheatsheet for Graphviz - a graph visualization software

Updated 2026-09-24

grep searches files and streams for matching text. This cheatsheet covers everyday grep options for matching, counting, context, recursion, regular expressions, and filtering files.

Updated 2026-06-21

The HTML5 Canvas element is used to draw graphics on a web page. It provides a 2D drawing API that can be used to draw shapes, text, images, and more.

Updated 2024-06-22

Java cheat sheet with common syntax for variables, control flow, collections, classes, records, inheritance, streams, lambdas, exceptions, and string formatting.

Updated 2026-08-15

Java String.format cheatsheet for quick reference. Learn about basic syntax, argument indexing, repeated arguments, format specifiers, and advanced formatting techniques.

Updated 2026-06-21

JavaPoet is a Java API for generating source files, types, methods, fields, and code blocks programmatically.

Updated 2023-03-01

JQ cheat sheet with runnable examples for JSON filters, editing, arrays, strings, math, CSV output, and custom functions. Copy each recipe or try it in the playground.

Updated 2026-09-18

JSONPath cheat sheet with copy-pasteable examples: object/array selectors, wildcards, recursive descent, filter expressions with comparison operators, and aggregate functions.

Updated 2026-09-20

k6 cheat sheet: write and run k6 load tests with Grafana's k6 tool -- minimal scripts, CLI flags, stages/ramping, thresholds, checks, HTTP requests, scenarios/executors, built-in metrics, custom metrics, and lifecycle hooks.

Updated 2026-10-06

kubectl is the command line tool for interacting with Kubernetes clusters. This cheatsheet covers essential kubectl commands for managing resources, troubleshooting, and everyday cluster operations.

Updated 2025-05-16

Lua cheat sheet: variables and types, control flow, tables (arrays, maps, OOP via colon methods), the string library, functions and closures, metatables, coroutines, and error handling (pcall).

Updated 2026-10-06

Free Markdown cheat sheet covering headings, lists (nested, mixed, task lists), tables, links, code blocks, and the CommonMark/GFM syntax you'll actually reach for.

Updated 2026-09-19

Mermaid cheat sheet with complete, copyable diagrams for flowcharts, sequences, classes, ER models, states, and timelines. Preview each example or edit it in the playground.

Updated 2026-09-18

MySQL cheatsheet - common commands and operations.

Nginx cheat sheet: config file structure, location block matching, reverse proxying and load balancing, TLS/SSL, gzip compression, and common CLI commands.

Updated 2026-09-29

OpenSCAD cheat sheet with copyable, runnable examples for 3D and 2D primitives, transforms, boolean operations, extrusion, modules, loops, and Customizer parameters. Open any example in the browser playground.

Updated 2026-10-13

OpenSSL cheat sheet: generate private keys and CSRs, inspect and verify certificates, self-signed certs, TLS handshake testing with s_client, and common conversions.

Updated 2026-09-29

Cheatsheet for PlantUML - text-based UML and diagramming syntax

Updated 2026-09-24

PostgreSQL and psql cheatsheet - common connection commands, psql meta-commands, database/table operations, users and roles, backup/restore, and everyday SQL for Postgres.

Updated 2026-08-25

PowerShell cheat sheet: cmdlet naming (Verb-Noun), pipeline objects, filesystem/process/service commands, variables and scripting basics, and remoting.

Updated 2026-09-28

Python quick reference cheatsheet with common syntax for data types, control flow, functions, classes, imports, files, and virtual environments.

Updated 2026-02-15

Redis cheat sheet: redis-cli basics, string/hash/list/set/sorted-set commands, expiration and TTL, pub/sub, and persistence/replication basics.

Updated 2026-09-28

Regular Expressions (Regex) cheatsheet for quick reference. Learn about basic operations, character sets, quantifiers, anchors, groups, and named groups in Regex

Updated 2023-02-28

Rust cheat sheet with common syntax for variables, control flow, ownership, borrowing, structs, enums, traits, Result, Option, vectors, and HashMap usage.

Updated 2026-08-15

sed is a stream editor for transforming text in files and pipelines. This cheatsheet covers substitutions, ranges, deletion, printing, capture groups, insertion, appending, and in-place edits.

Updated 2026-06-21

Cheatsheet for SQL: SQL is a domain-specific language used for managing and manipulating relational databases.

Updated 2023-02-28

Cheatsheet for SQLite commands and queries. SQLite is a C-language library that implements a small, fast, self-contained, high-reliability, full-featured, SQL database engine.

Updated 2026-09-22

ssh connects securely to remote machines and can also run commands, transfer files, forward ports, and use jump hosts. This cheatsheet covers common OpenSSH client workflows.

Updated 2026-06-21

Tar is a widely used command in Unix/Linux for archiving files. It allows you to create, extract, and manage compressed archive files using different compression formats like gzip and bzip2, with create/extract/gzip/list examples.

Updated 2026-09-21

tmux is a terminal multiplexer for keeping terminal sessions running, organizing windows and panes, and reconnecting later. This cheatsheet covers sessions, windows, panes, copy mode, and the prefix key.

Updated 2026-06-21

Unzip is a widely used command-line utility for extracting files from .zip archives. It supports listing, testing, and extracting contents to specified directories, with list/extract-to/overwrite flag examples.

Updated 2026-09-26

Vim cheat sheet: modes (normal/insert/visual/command), motions and text objects, editing and search/replace commands, buffers/windows/tabs, and :set options.

Updated 2026-09-27

XML is a markup language for representing structured documents with elements, attributes, namespaces, and text.

Updated 2026-09-21

XPath selects nodes from XML and HTML documents using paths, axes, predicates, and functions.

Updated 2026-06-21

Free YAML cheat sheet covering syntax, scalars, anchors/aliases, multi-document files, and the common gotchas (Norway problem, tabs, trailing colons) that break configs.

Updated 2026-09-18

Zip is a popular command-line utility for compressing and archiving files. It creates compressed archives in the .zip format, with recursive directory, exclude-pattern, and compression-level examples.

Updated 2026-09-25

Common HTTP Codes

Reference table of HTTP status codes and their meanings.