TLDR reference
Searchable quick-reference screens: git, regex, SQL, HTTP, Docker, ports, MIME types and more - one cheatsheet each, type to filter.
Open My Screen Your personal dashboard - add tools from any category onto one page.
Reference
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DM Screen - 2024 rules
Quick reference: cards with TLDR summaries and instant search.
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DM Screen - 2014 rules
The same reference for the older edition of the rules.
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HTTP status codes
A searchable HTTP status code reference - every code with its meaning, grouped by class (1xx to 5xx), filterable, with links to the details. Runs entirely in your browser.
Commands
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Git commands
A searchable git command reference - common tasks like "undo the last commit" or "rename a branch" paired with the exact command, grouped by intent and filterable. Runs entirely in your browser.
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Bash commands
A searchable bash and Linux command reference - everyday shell tasks paired with the exact command, grouped by intent and filterable. Runs entirely in your browser.
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Docker commands
A searchable Docker command reference - image, container, and compose tasks paired with the exact command, grouped by intent. Runs entirely in your browser.
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chmod permissions
A searchable chmod and permissions reference - octal modes, the rwx bits, special bits, and symbolic syntax, each explained. Runs entirely in your browser.
Web & network
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HTTP headers
A searchable HTTP headers reference - request and response headers, each with a one-line meaning and example, grouped by purpose and filterable. Runs entirely in your browser.
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Well-known ports
A searchable well-known ports reference - port numbers mapped to their service and transport, grouped by purpose and filterable. From 80 and 443 to 5432 and 6379. Runs entirely in your browser.
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MIME types
A searchable MIME types reference - file extensions mapped to their Content-Type, grouped by kind and filterable. Runs entirely in your browser.
Syntax & markup
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Regex cheatsheet
A searchable regular-expression cheatsheet - anchors, character classes, quantifiers, groups, lookaround, and flags, each with an example. Runs entirely in your browser.
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Markdown cheatsheet
A searchable Markdown cheatsheet - every syntax with a live rendered preview per row, grouped and filterable. Runs entirely in your browser.
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HTML tags
A searchable HTML tags reference - every element with a one-line meaning and a still-legit flag, grouped by purpose and filterable. Runs entirely in your browser.
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Date format tokens
A searchable date format reference - PHP date() and C/strftime tokens side by side with an example each, grouped by part of the date. Runs entirely in your browser.
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Unicode & ASCII symbols
A searchable Unicode and ASCII symbol reference - arrows, currency, math, punctuation, Greek, and box-drawing characters, each with its name and every code (U+, HTML entity, CSS escape, decimal). Click a glyph to copy it. Runs entirely in your browser.
Data & licensing
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SQL cheatsheet
A searchable SQL cheatsheet - joins, filtering, aggregation, and the common query patterns with copyable snippets, grouped and filterable. Runs entirely in your browser.
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OSS licenses
A searchable open-source license reference - MIT, Apache, GPL and more summarised as what you can do, must do, and are not granted. Runs entirely in your browser.