# In VPS/ubuntu:

sudo apt-get install youtube-dl

sudo youtube-dl -U

#repeat until it end with “Updated to 20xx/yy/zz”

sudo youtube-dl -U 

#Download youtube video:

youtube-dl -t VIDEO_URL

# Get Help

youtube-dl -h

Link:

  http://rg3.github.com/youtube-dl/

youtube format:

  http://en.wikipedia.org/wiki/YouTube#Quality_and_codecs