Download a video

Continue a previously cancelled download
youtube-dl -c

Request the file formats of the video
youtube-dl -F

Download the video in specified format
youtube-dl -f

Batch download
youtube-dl -a filename.txt

Batch download and use title in filename
youtube-dl -at filename.txt

Extract audio
youtube-dl –extract-audio
youtube-dl –audio-format mp3
youtube-dl –audio-quality 256k

Extract audio and keep the video
youtube-dl –audio-format mp3 –audio-quality 176 -k