Cheatsheets

Choose a topic or search all topics. Search matches topic names, section titles and example text. Sections can be collapsed; searching opens matches and clearing the search restores their previous state.

The copy button copies exactly the displayed example, including line breaks. Examples are reference notes with placeholders, comments and sometimes several commands per line; they are not complete scripts. Syntax and shortcuts can differ by version, platform or dialect. Examples retain command syntax and may include English comments.

The hash sample calculates the UTF-8 bytes of hello, without a newline, only when requested. Switching topics discards pending output. Reference content is bundled locally; clipboard access and Web Crypto depend on browser support.

Fast checksums are not password storage schemes. See the OWASP password storage guidance.

Keyboard notation: + means keys held together, → means press in sequence, / separates alternatives. Emacs C- means Ctrl and M- means Meta (usually Alt). Tmux examples assume its default Ctrl+b prefix; copy-mode keys depend on vi/emacs mode. Search filters the selected topic; choose All topics for a global search.

Only your topic and exact search text stay in this browser after navigation and reload. Card expansion, clipboard messages and calculated samples are not stored. Reset returns to Regex with an empty search.