youtube-dl安装
sudo wget https://yt-dl.org/downloads/latest/youtube-dl -O /usr/local/bin/youtube-dl sudo chmod a+rx /usr/local/bin/youtube-dl
youtube-dl帮助
youtube-dl -h
youtube-dl查询视频格式
youtube-dl -F url
youtube-dl 下载视频
youtube-dl -f 22 url
01 Apr 2017