youtube-dl -f 22 example.com/watch?v=id
youtube-dl -f 22/45/120
youtube-dl -F example.com/watch?v=id
youtube-dl -o '%(uploader)s/%(date)s/%(title)s.%(ext)s' example.com/watch?v=id
youtube-dl --playlist-start 5 example.com/watch?v=id&list=listid
youtube-dl -s example.com/watch?v=id
youtube-dl --extract-audio --audio-format mp3 --audio-quality 0 example.com/watch?v=id
tldr:youtube-dl
More information: http://rg3.github.io/youtube-dl/.
youtube-dl 'https://www.youtube.com/watch?v=oHg5SJYRHA0'
youtube-dl --list-formats 'https://www.youtube.com/watch?v=Mwa0_nE9H7A'
youtube-dl --format "best[height<=480]" 'https://www.youtube.com/watch?v=oHg5SJYRHA0'
youtube-dl -x --audio-format mp3 'url'
youtube-dl -f bestvideo+bestaudio 'url'
youtube-dl --format mp4 -o "%(playlist_index)s-%(title)s by %(uploader)s on %(upload_date)s in %(playlist)s.%(ext)s" 'url'
youtube-dl --sub-lang en --write-sub 'https://www.youtube.com/watch?v=Mwa0_nE9H7A'
youtube-dl -f "bestaudio" --continue --no-overwrites --ignore-errors --extract-audio --audio-format mp3 -o "%(title)s.%(ext)s" url_to_playlist