Linux Lab Cards

Purpose

This site is intended as general study material for Linux, macOS-adjacent command-line notes, networking, storage, services, and data-centre troubleshooting concepts.

No warranty of accuracy

The material is provided as-is, without any claim or warranty that every command, answer, scenario, or explanation is accurate, complete, current, safe, or suitable for a particular environment.

Verify before use

Visitors are strongly advised to check every question, answer, and command against official documentation, local policy, vendor guidance, and the specific system they are working on before relying on it.

Revise freely

This deck is designed to be revised, corrected, extended, and adapted. Treat it as a learning scaffold, not as official operational documentation.

Walk Mode audio reader

Walk Mode uses the browser's built-in speech synthesis support to read cards aloud. The app does not generate, upload, or store audio files. By default, Walk Mode uses brief playback and reads the answer plus quick explanation. These Walk Mode preferences are remembered locally until Reset is pressed. Brief playback can skip spoken wrapper text such as card number, category, and difficulty. The optional Keep awake setting uses the browser Screen Wake Lock API where supported. When Keep awake is successfully enabled, the app also enables a tap guard so page actions require confirmation before running. If the browser does not support wake lock, the app leaves Keep awake off and shows fallback guidance. On unsupported browsers, users may need to adjust device Auto-Lock settings manually. A JavaScript loop cannot reliably prevent iPhone Auto-Lock. The optional Screen helper fallback starts a tiny local muted looping video after a user gesture; this may help on some browsers, but it is not guaranteed. Walk Mode can insert a scheduled rest pause after a chosen number of cards, and command examples are rewritten for more useful speech pronunciation. Voice quality and available voices depend on the browser, operating system, and installed voices. Behaviour may vary by device power settings, especially if the screen locks.

Privacy and storage

The application is a static site. It has no login, no database, and no upload feature. Flashcard progress and Walk Mode preferences are stored locally in the visitor's browser using localStorage. No cookies are used. The app does not send flashcard progress or Walk Mode preferences to the server.

Content and assets

The deck text and site files are original study material. No third-party images, vendor manuals, or scraped diagrams are bundled. Any future images should be original diagrams or assets with clearly permissive rights.

Security posture

The site is intentionally simple: static HTML, CSS, JavaScript, and JSON. It does not require PHP, a server-side database, user accounts, or a CMS to operate.

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