# Cheat sheet A cheat sheet condenses useful information for quick reference, including programming commands, APIs, syntax, and workflows. This is one page of public article previews, not the complete archive. Follow Next page to continue. Summaries are not the original full articles. ## What is the Super key in Omarchy? DevFeed: [What is the Super key in Omarchy?]() Original publisher: [Read original article]() Author: Roger Perkin Published: 2026-09-11T09:52:11Z Content type: tutorial Language: en Sources: [Roger Perkin Network Automation Consultant]() Topics: [navigation](), [Cheat sheet](), [configuration](), [Terminal](), [App]() Tags: [cheat-sheet](), [commands](), [faq](), [shortcuts](), [terminal](), [vim](), [windows]() ### AI overview This tutorial explains that Omarchy uses the Super key as the primary modifier for system navigation and shortcuts. It describes ten shortcut categories, including launching applications, closing windows, opening a terminal, changing layouts, viewing keybindings, navigating windows, switching workspaces, and moving windows between workspaces. ### Source excerpt In Omarchy, the Super key acts as the primary modifier key for almost all system navigation and shortcuts, functioning as the Windows key on standard keyboards or the Command key on a Mac layout Based on standard Omarchy configurations and recent Hyprland window manager defaults, here are the top 10 essential Super key combinations you need to know for ... ## VAT Compliance for Digital Products: A Country-by-Country Cheat Sheet DevFeed: [VAT Compliance for Digital Products: A Country-by-Country Cheat Sheet]() Original publisher: [Read original article]() Author: Ayush Agarwal Published: 2026-05-05T00:00:00Z Content type: tutorial Language: en Sources: [Dodo Payments Blog]() Topics: [Cheat sheet](), [Software as a service]() Tags: [compliance](), [digital-products](), [guides](), [merchant-of-record](), [saas](), [tax](), [vat]() ### AI overview A country-by-country guide to VAT compliance for digital products, covering taxable product categories, destination-based taxation, thresholds, registration, B2B and B2C treatment, and practical compliance options such as using a Merchant of Record. ### Source excerpt VAT compliance for digital products explained country-by-country. Thresholds, rates, registration paths, and when a Merchant of Record is the right call. ## Notes on clarifying man pages DevFeed: [Notes on clarifying man pages]() Original publisher: [Read original article]() Author: Julia Evans Published: 2026-02-18T00:00:00Z Content type: opinion Language: en Sources: [Julia Evans]() Topics: [Documentation](), [Cheat sheet](), [Tool](), [ASCII](), [Git](), [ls](), [Perl]() Tags: [ascii](), [cheat-sheet](), [documentation](), [examples](), [git](), [notes]() ### AI overview The article explores ways to make Unix man pages easier to navigate and more useful. It considers embedding concise cheat sheets, using terse SYNOPSIS sections with OPTIONS SUMMARY sections, grouping options by category, providing condensed ASCII layouts, and including practical examples. ### Source excerpt Hello! After spending some time working on the Git man pages last year, I've been thinking a little more about what makes a good man page. I've spent a lot of time writing cheat sheets for tools (tcpdump, git, dig, etc) which have a man page as their primary documentation. This is because I often find the man pages hard to navigate to get the information I want. Lately I've wondering - could the man page itself have an amazing cheat sheet in it? What might make a man page easier to use? I'm still very early in thinking about this but I wanted to write down some quick notes. I asked some people on Mastodon for their favourite man pages, and here are some examples of interesting things I saw on those man pages. an OPTIONS SUMMARY If you've read a lot of man pages you've probably seen something like this in the SYNOPSIS: once you're listing almost the entire alphabet, it's hard ls [-@ABCFGHILOPRSTUWabcdefghiklmnopqrstuvwxy1%,] grep [-abcdDEFGHhIiJLlMmnOopqRSsUVvwXxZz] The rsync man page has a solution I've never seen before: it keeps its SYNOPSIS very terse, like this: Local: rsync [OPTION...] SRC... [DEST] and then has an "OPTIONS SUMMARY" section with a 1-line summary of each option, like this: --verbose, -v increase verbosity --info=FLAGS fine-grained informational verbosity --debug=FLAGS fine-grained debug verbosity --stderr=e|a|c change stderr output mode (default: errors) --quiet, -q suppress non-error messages --no-motd suppress daemon-mode MOTD Then later there's the usual OPTIONS section with a full description of each option. an OPTIONS section organized by category The strace man page organizes its options by category (like "General", "Startup", "Tracing", and "Filtering", "Output Format") instead of alphabetically. As an experiment I tried to take the grep man page and make an "OPTIONS SUMMARY" section grouped by category, you can see the results here. I'm not sure what I think of the results but it was a fun exercise. When I was writing that I was thinking ## TLS Certificate Cheat Sheet - OpenSSL & Curl DevFeed: [TLS Certificate Cheat Sheet - OpenSSL & Curl]() Original publisher: [Read original article]() Author: Chris Hager Published: 2025-09-22T00:00:00Z Content type: tutorial Language: en Sources: [Chris Hager]() Topics: [TLS (Transport Layer Security)](), [certificates](), [Cheat sheet](), [openssl](), [cURL]() Tags: [certificates](), [cheat-sheet](), [curl](), [openssl](), [tls](), [tools]() ### AI overview A cheat sheet for creating, inspecting, signing, validating, and testing TLS certificates and related keys and CSRs using OpenSSL and cURL. ### Source excerpt https://collective.flashbots.net/t/tls-certificates-know-how-quick-reference/5292 ## A Docker Deep-Dive Cheatsheet DevFeed: [A Docker Deep-Dive Cheatsheet]() Original publisher: [Read original article]() Author: Caleb Mellas Published: 2024-06-19T12:04:00Z Content type: tutorial Language: en Sources: [Level up software engineering]() Topics: [Docker](), [Cheat sheet](), [DevOps]() Tags: [cheatsheet](), [devops](), [docker]() ### AI overview The article presents a Docker deep-dive cheatsheet and states that Docker has become prominent in the DevOps world, recommending that developers learn it. ### Source excerpt Docker is something that has taken the devops world by storm the last few years. You are going to need to get good at it sooner rather than later. ## onwebkitplaybacktargetavailabilitychanged?! New exotic events in the XSS cheat sheet DevFeed: [onwebkitplaybacktargetavailabilitychanged?! New exotic events in the XSS cheat sheet]() Original publisher: [Read original article]() Author: Gareth Heyes Published: 2024-06-11T14:58:29Z Content type: article Language: en Sources: [PortSwigger Research]() Topics: [Cheat sheet](), [Security](), [Web](), [Mozilla](), [marquee]() Tags: [audio](), [cheat-sheet](), [code](), [community](), [contribute](), [firefox](), [marquee](), [mozilla](), [security](), [tool](), [update](), [video](), [web]() ### AI overview An update to PortSwigger's XSS cheat sheet adds and documents exotic browser event vectors, including Safari audio and video behavior, pointer interaction, autofocus usage, and WebKit trackpad events. The article also credits community contributions and Mozilla's help removing obsolete marquee events from Firefox. ### Source excerpt The power of our XSS cheat sheet is we get fantastic contributions from the web security community and this update is no exception. We had valuable contributions from Mozilla to remove events that no ## Email DNS Records Cheatsheet DevFeed: [Email DNS Records Cheatsheet]() Original publisher: [Read original article]() Published: 2024-04-12T20:02:49Z Content type: article Language: en Sources: [Signs of Triviality]() Topics: [Cheat sheet](), [email]() Tags: [cheatsheet](), [email](), [examples](), [smtp](), [summary]() ### AI overview A quick summary of SMTP-related DNS records with brief examples. ### Source excerpt A quick summary of the SMTP related DNS records together with brief examples. ## Top considerations for addressing risks in the OWASP Top 10 for LLMs DevFeed: [Top considerations for addressing risks in the OWASP Top 10 for LLMs]() Original publisher: [Read original article]() Author: Simon Maple Published: 2023-09-07T05:00:00Z Content type: article Language: en Sources: [Blog RSS Feed | Snyk]() Topics: [Application Security](), [Large Language Model](), [Security](), [Cheat sheet](), [prompt injection](), [Natural language processing]() Tags: [ai](), [application-security](), [cheat-sheet](), [developer](), [devrel](), [llms](), [prompt-injection](), [security](), [snyk](), [snyk-code](), [snyk-open-source]() ### AI overview This cheat sheet introduces the OWASP Top 10 for large language models (LLMs), explaining that the list identifies major security risks and attack vectors affecting applications that use LLM technology. It provides context on LLMs, their relationship to natural language processing, and prompt injection as one of the listed risks. ### Source excerpt Welcome to our cheat sheet covering the OWASP Top 10 for LLMs where we'll explore the top security risks identified by OWASP. ## kubectl Cheat Sheet DevFeed: [kubectl Cheat Sheet]() Original publisher: [Read original article]() Author: info@goteleport.com (Deborah Ruck) Published: 2022-04-11T00:00:00Z Content type: tutorial Language: en Sources: [Teleport]() Topics: [kubectl](), [Cheat sheet](), [Kubernetes](), [Kubernetes clusters](), [Command-line interface](), [REST API]() Tags: [cheat-sheet](), [command-line](), [containers](), [examples](), [kubectl](), [kubernetes](), [kubernetes-clusters](), [rest-api]() ### AI overview A practical kubectl cheat sheet explaining how to use Kubernetes' command-line tool to interact with the Kubernetes API, manage cluster resources, deploy applications, and view logs. It covers command syntax, resource types, names, and command-line flags. ### Source excerpt Quickly interact with Kubernetes clusters using kubectl by leveraging these useful kubectl commands and examples. ## Push Cheatsheet DevFeed: [Push Cheatsheet]() Original publisher: [Read original article]() Author: Steve Hannah Published: 2019-09-27T00:00:00Z Content type: tutorial Language: en Sources: [CodeName One]() Topics: [Cheat sheet](), [Mobile](), [Tutorial](), [pdf]() Tags: [apple](), [cheatsheet](), [firebase](), [firebase-console](), [http](), [mobile](), [mobile-apps](), [notifications](), [windows]() ### AI overview A quick-reference cheatsheet for configuring push notifications in Codename One mobile apps across iOS, Android, and Windows. It summarizes platform setup requirements, device registration and message-handling code, HTTP requests for sending pushes, and push message types. ### Source excerpt Push support is one of the most complicated features to set up, due to all of the red tape you have to cut through on each platform. Each platform has its own series of hurdles you have to jump through. Apple (iOS) requires you to generate push certificates. Google (Android) requires you to set up a project in Firebase console. Microsoft requires you to register your app for the Windows store. And that's just the beginning. ## 6 Things to Know Before Migrating An Existing Service to Serverless DevFeed: [6 Things to Know Before Migrating An Existing Service to Serverless]() Original publisher: [Read original article]() Author: Marcia Villalba Published: 2017-08-07T00:00:00Z Content type: article Language: en Sources: [Serverless Blog]() Topics: [Serverless](), [migration](), [Cheat sheet]() Tags: [aws](), [aws-lambda](), [cheatsheet](), [cloud-computing](), [customers](), [engineering](), [faas](), [function-as-a-service](), [infrastructure-as-code](), [migration](), [serverless](), [serverless-architecture](), [serverless-framework]() ### AI overview An article outlining six things to know before migrating an existing service to serverless. ### Source excerpt Your cheatsheet to a seamless migration. ## Polymer 1.x Cheat Sheet DevFeed: [Polymer 1.x Cheat Sheet]() Original publisher: [Read original article]() Author: Monica Dinculescu Published: 2016-12-13T00:00:00Z Content type: tutorial Language: en Sources: [Monica Dinculescu]() Topics: [Cheat sheet](), [Library](), [Web Components](), [Code](), [JavaScript](), [CSS](), [Document Object Model (DOM)]() Tags: [browser](), [cheat-sheet](), [code](), [components](), [css](), [javascript]() ### AI overview A cheat sheet for the Polymer 1.x library covering Web Components development, including element and behavior definitions, lifecycle methods, data binding, observers, listeners, properties, style modules, custom properties, mixins, and template helpers. ### Source excerpt This is a cheat sheet for the Polymer 1.x library. It helps you write Web Components, which are pretty 🔥🔥🔥. If you're interested in the Polymer 2.0 cheat sheet, it's here. If you think something is missing from this page, tell me about it! Defining an element Defining a behaviour Lifecycle methods Data binding Observers Listeners Properties block Observing added and removed children Style modules Styling with custom properties and mixins Binding helper elements Defining an element Docs: registering an element, behaviours, shared style modules Defining a behaviour Docs: behaviours. Defining a behavior to share implementation between different elements: Using the behavior in an element: Lifecycle methods Docs: lifecycle callbacks. Polymer({ registered: function() {}, created: function() {}, ready: function() {}, attached: function() {}, detached: function() {} }); There's an attributeChanged callback as well, but that's very rarely used. Data binding Docs: data binding, attribute binding, binding to array items, computed bindings. Don't forget: Polymer camel-c ## AngularJS and Ionic performance cheat sheet DevFeed: [AngularJS and Ionic performance cheat sheet]() Original publisher: [Read original article]() Published: 2015-08-24T00:00:00Z Content type: article Language: en Sources: [Juri Strumpflohner]() Topics: [Angular](), [Ionic](), [Cheat sheet]() Tags: [angular](), [article](), [ionic](), [performance](), [v1]() ### AI overview A cheat sheet listing performance tips and tricks for Angular v1.x and Ionic, including one-time binding, track by, disabling debug diagnostics, and loop-related considerations. ### Source excerpt Lorem ipsum dolor sit amet ## Emacs Cheat Sheet DevFeed: [Emacs Cheat Sheet]() Original publisher: [Read original article]() Author: Dimitri Fontaine PostgreSQL Major Contributor; Author Published: 2011-07-20T08:44:00Z Content type: article Language: en Sources: [Dimitri Fontaine]() Topics: [Cheat sheet](), [Emacs]() Tags: [cheat-sheet](), [emacs](), [example]() ### AI overview An Emacs cheat sheet highlights useful default keyboard chords, including C-x C-o for delete-blank-lines and C-M-o for split-line. ### Source excerpt I stumbled upon the following cheat sheet for Emacs yesterday, and it's worth sharing. I already learnt or discovered again some nice default chords, like for example C-x C-o runs the command delete-blank-lines and C-M-o runs the command split-line. I guess I will use the later one a lot. Hope you'll like it! ## MySQL quick reference DevFeed: [MySQL quick reference]() Original publisher: [Read original article]() Author: Graham King Published: 2008-08-16T00:30:37Z Content type: tutorial Language: en Sources: [Graham King]() Topics: [Cheat sheet](), [MySQL](), [SQL](), [Databases]() Tags: [cheat-sheet](), [command-line](), [database](), [mysql](), [reference](), [replication](), [software](), [sql](), [utf8]() ### AI overview A concise MySQL command reference covering database and table queries, columns, indexes, foreign keys, auto-increment values, character-set variables, command-line database dumps and loads, imports and exports, DDL operations, and replication status commands. ### Source excerpt "Your go-to MySQL command cheat sheet for quick reference."