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#metadata (3)

Cheat sheets (3)

packaging — Version Parsing and Requirement Specifiers

Package-level reference for packaging on PyPI — Version, SpecifierSet, Requirement, markers, install, alternatives.
pip package versioning metadata pep

xattr — Extended Attributes on macOS

Deep-dive on macOS extended attributes — listing, reading, writing, and removing xattrs with xattr(1); the Gatekeeper com.apple.quarantine flag; Spotlight metadata attributes; ACLs via ls -le and chmod +a; preserving attributes on copy with cp -p and rsync -X.
xattr macos cli filesystem security gatekeeper quarantine acl metadata web-researched

ffprobe — Media Stream Inspection

Comprehensive ffprobe reference for inspecting media files — formats, streams, frames, packets, chapters, metadata — with output formats (default, json, csv, xml, flat, ini), select_streams, show_entries, and one-liners for duration, fps, codec, resolution, and bitrate.
ffprobe ffmpeg video audio metadata json jq streams codec bitrate fps cli web-researched