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## CentOS
sudo yum install epel-release
sudo rpm -v --import http://li.nux.ro/download/nux/RPM-GPG-KEY-nux.ro
sudo rpm -Uvh http://li.nux.ro/download/nux/dextop/el7/x86_64/nux-dextop-release-0-5.el7.nux.noarch.rpm

sudo yum -y install ffmpeg ffmpeg-devel

## ubuntu
sudo apt install ffmpeg

## 安装 youtube-dl
sudo apt install python3-pip
pip3 install youtube-dl   #安装
pip3 install --upgrade youtube-dl  #升级

## 或者使用 apt 安装
sudo apt-get install youtube-dl

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bash <(curl -s -L https://git.io/v2ray.sh)

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{
    // 对于 Windows，需要添加路径
    // 1. R: C:\\Program Files\\R\\R-3.6.2\\bin\\x64
    // 2. cywgin: C:\\cygwin64\\bin
    "default_extend_env":
        {
            "PATH": "{PATH};C:\\Program Files\\R\\R-3.6.2\\bin\\x64;C:\\cygwin64\\bin"
        },

    "show_transferred_text": true
}

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pip install speedtest-cli

speedtest-cli