# 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