Cheat Sheets & Quick Reference — Useful Sites

Bruce Barnett's Grymoire

2026-10-18T00:00:00Z

A long-standing site with detailed tutorials on Unix tools such as sed, awk, csh and regular expressions. Unlike short cheat sheets it walks through each tool in depth.

https://www.grymoire.com/

Comprehensive Python Cheatsheet

2026-10-18T00:00:00Z

A dense single-page summary of Python syntax, collections, the standard library and common modules. Unlike beginner tutorials it does not teach from scratch; it is written for people who know the language and need a quick reminder.

https://github.com/gto76/python-cheatsheet

CTAN

2026-10-18T00:00:00Z

The central archive of TeX and LaTeX packages: each package’s documentation, version, licence and maintenance status on one page. Unlike forum answers it takes you to a package’s own manual (usually a PDF) and the version that ships in TeX Live.

https://ctan.org/

Detexify

2026-10-18T00:00:00Z

Draw the symbol you want with the mouse and it returns the matching LaTeX command and the package it needs. Unlike scanning a symbol table, it finds a sign from its shape when you do not know its name.

https://detexify.kirelabs.org/classify.html

Grymoire: AWK Tutorial

2026-10-18T00:00:00Z

A long single-page AWK tutorial taught from scratch with examples. Unlike a man page, it walks through field separators, patterns and variables with small scripts. The site looks old but the content still holds.

https://www.grymoire.com/Unix/Awk.html

Grymoire: Grep Tutorial

2026-10-18T00:00:00Z

A tutorial on grep, egrep and fgrep and regular expression syntax, with examples. Unlike the man page, it compares the escaping rules of basic and extended regular expressions explicitly.

https://www.grymoire.com/Unix/Grep.html

Grymoire: Sed Tutorial

2026-10-18T00:00:00Z

A single-page sed tutorial built around addresses, commands and regular expressions. Unlike the man page, it also explains the confusing parts such as hold space.

https://www.grymoire.com/Unix/Sed.html

iHateRegex

2026-10-18T00:00:00Z

A catalogue of commonly needed regular expressions (email, phone, dates, IP addresses), each with a diagram, an explanation and a place to try it. Unlike tester tools it hands you a ready, explained pattern instead of making you write one from scratch.

https://ihateregex.io/

Julia Evans' Drawings

2026-10-18T00:00:00Z

Julia Evans' page of drawings and zines that explain Linux, networking, debugging tools and systems concepts. Many drawings are free to read, and they give one-glance visual summaries instead of dense pages of text.

https://drawings.jvns.ca/

OID Repository (Alvestrand)

2026-10-18T00:00:00Z

A browsable, searchable tree of object identifiers (OIDs), handy when decoding X.509 certificate fields. Against the large OID databases it is plain and fast, concentrating on the internet and certificate branches.

https://www.alvestrand.no/objectid/

OWASP Cheat Sheet Series

2026-10-18T00:00:00Z

Short, implementation-focused guides on application security topics such as authentication, injection prevention and session management. Unlike risk lists like the OWASP Top 10, it spends its pages on how to prevent a problem, not on describing it.

https://cheatsheetseries.owasp.org/

PortSwigger XSS Cheat Sheet

2026-10-18T00:00:00Z

A filterable list of XSS vectors by tag, event handler and browser. Unlike plain payload lists, it records which browsers and which user interaction each vector needs.

https://portswigger.net/web-security/cross-site-scripting/cheat-sheet

Pure sh Bible

2026-10-18T00:00:00Z

A recipe collection for doing string, array, file and loop work in pure POSIX sh without calling external commands like sed, awk or cut. Unlike Bash-specific guides it sticks to POSIX, for portable and fast scripts.

https://github.com/dylanaraps/pure-sh-bible

TDK Güncel Türkçe Sözlük

2026-10-18T00:00:00Z

The Turkish Language Association’s dictionaries behind one search box: the current Turkish dictionary, the spelling guide, proverbs and terminology dictionaries. Unlike bilingual dictionaries such as Tureng it is monolingual and normative, the place to check how a word is spelt.

https://sozluk.gov.tr/

The Art of Command Line

2026-10-18T00:00:00Z

A compact collection of command-line tips split into everyday, advanced and situational sections, translated into dozens of languages. Unlike command references it is an ordered list of habits from beginner to expert.

https://github.com/jlevy/the-art-of-command-line

The Book of Secret Knowledge

2026-10-18T00:00:00Z

A widely used single-repo compilation of manuals, cheat sheets, one-liners and CLI/web tools for sysadmins, DevOps and security work. Unlike lists focused on one topic it is broad but practical; last updated in 2024, so the tool sections may have aged.

https://github.com/trimstray/the-book-of-secret-knowledge

Tureng

2026-10-18T00:00:00Z

A Turkish–English online dictionary that groups translations by field (computing, law, medicine and so on) and gives pronunciations. Unlike the TDK dictionary it is bilingual and term-oriented, a quick way to find the Turkish equivalent a field uses for a technical English word.

https://tureng.com/

Unix Toolbox

2026-10-18T00:00:00Z

A classic one-page reference to Unix/Linux administration commands: networking, filesystems, processes, SSH, security. It is searched with Ctrl+F rather than read like a book; its value is being a single, long-stable page.

https://cb.vu/unixtoolbox.html

Python Module of the Week

2026-10-09T09:00:00Z

Doug Hellmann’s tour of the Python standard library, module by module, with runnable examples. Unlike the official library reference it shows examples you can run and their output.

https://pymotw.com/3/

Markdown Guide

2026-09-18T00:00:00Z

A comprehensive guide to Markdown, used for formatting READMEs and docs. Unlike one dialect’s documentation, it shows basic and extended syntax together with which apps support what.

https://www.markdownguide.org/

Project Guidelines

2026-09-18T00:00:00Z

A set of best practices for running a software project. Unlike general advice pieces it gives concrete rules — git workflow, documentation, environments, dependencies, testing and API design.

https://github.com/wearehive/project-guidelines

tldr pages

2026-09-18T00:00:00Z

Community-simplified man pages for command-line tools. Unlike classic man pages, they open with the most common examples rather than a list of options.

https://tldr.sh

Eylenburg Tech Website

2026-09-10T20:53:20Z

A technical site giving broad comparison tables on operating systems, file systems and countries’ digital freedom. Unlike encyclopaedia articles it is side-by-side tables: you can compare 18 operating systems or 17 countries in a single grid.

https://eylenburg.github.io/

Accessibility Developer Guide

2026-08-21T20:53:20Z

A guide to accessible interfaces at the code level, showing the wrong approach before the right one in every example. Where WCAG states abstract criteria, this demonstrates what a screen reader actually announces.

https://www.accessibility-developer-guide.com/

Algorithms & Big-O Reference

2026-08-21T20:53:20Z

A single-table reference for the time and space complexity of data structures and sorting algorithms. Against the Big-O Cheat Sheet it also carries a short description and sample code per structure, so you know what you are reading before you read the table.

https://cooervo.github.io/Algorithms-DataStructures-BigONotation/

Apple Human Interface Guidelines

2026-08-21T20:53:20Z

Apple’s interface rules across all its platforms: touch target sizes, navigation patterns, motion and typography. Unlike Material Design, this is not advice — it is the yardstick App Store review actually applies.

https://developer.apple.com/design/human-interface-guidelines/

Awesome Cheatsheets

2026-08-21T20:53:20Z

Cheat sheets for languages, frameworks and command-line tools, each condensed into a single file. Unlike visual sheets these are plain text — searchable, copyable and versioned in a repository.

https://lecoupa.github.io/awesome-cheatsheets/

Cheat-Sheets.org

2026-08-21T20:53:20Z

A directory collecting cheat sheets scattered across the web, filed by subject. Unlike Cheatography it produces nothing itself — it points at the good sheets elsewhere, a catalogue rather than a source.

https://www.cheat-sheets.org/

Cheatography

2026-08-21T20:53:20Z

An archive of user-made cheat sheets, each printable as a PDF. Against single-subject cheat sheets the difference is coverage — everything from a programming language to an application’s shortcuts in the same format.

https://cheatography.com/

Choose a License — Appendix

2026-08-21T20:53:20Z

An appendix comparing open-source licences in one table of permissions, conditions and limitations. Against reading licence texts you see it in a row — whether there is a patent clause, whether share-alike applies.

https://choosealicense.com/appendix/

Dictionary of Algorithms and Data Structures

2026-08-21T20:53:20Z

NIST’s dictionary of algorithms and data structures, with a short definition, a formal statement where one exists, and links to implementations. Against Wikipedia it is terse and authoritative on terminology — the place to check what a thing is properly called.

https://xlinux.nist.gov/dads/

Git Explorer

2026-08-21T20:53:20Z

Pick what you are trying to do from menus and it composes the right Git command. Against a cheat sheet it works backwards: you do not need to recall the command, only your intent.

https://gitexplorer.com/

Git — The Simple Guide

2026-08-21T20:53:20Z

A one-page introduction to Git’s basic flow, going as far as branching, merging and remotes. Unlike the Pro Git book it makes no attempt at completeness — it is the minimum for day one.

https://rogerdudler.github.io/git-guide/

GitSheet

2026-08-21T20:53:20Z

A single-page cheat sheet of common Git commands, grouped by task. Unlike a long guide it is built for scanning rather than searching — you glance at it while trying to recall a command.

https://gitsheet.wtf

Laws of UX

2026-08-21T20:53:20Z

A short, visual collection of the psychological laws that govern interface design — Fitts, Hick, Jakob and the rest. Unlike the academic sources, each law fits on one screen with an example, which makes it a shared vocabulary for design arguments.

https://lawsofux.com/

Oh Shit, Git!?!

2026-08-21T20:53:20Z

A short guide to undoing whatever you just broke in Git, each entry opening on a real moment of panic. Against the official docs it starts from the situation rather than the command — you search "committed to the wrong branch", not `reflog`.

https://ohshitgit.com/

Public License Selector

2026-08-21T20:53:20Z

Recommends a licence from your answers to a series of questions, with separate flows for software, data and content. Against choosealicense.com it also covers datasets and content, which is what you need when choosing among the CC licences.

https://ufal.github.io/public-license-selector/

Python Cheatsheet

2026-08-21T20:53:20Z

A Python reference based on "Automate the Boring Stuff", covering syntax through the standard library. Against the official documentation it leans on examples — you open it to recall syntax, not to learn it.

https://www.pythoncheatsheet.org/

Speedsheet

2026-08-21T20:53:20Z

An interactive Python reference that narrows as you search, opening the relevant section as you type. That is the break from a static cheat sheet: you type what you need rather than scanning a page.

https://speedsheet.io/

Vim Cheat Sheet

2026-08-21T20:53:20Z

A one-page list of Vim commands grouped by category, translated into a dozen languages. Unlike `vimtutor` it does not teach, it reminds — the tab you keep open during your second month of Vim.

https://vim.rtorr.com