首先进入Linux的祖宗网站；如下图；www.kernel.org；
看一下当前最新版本为5.6.2；最早可以看到版本3.16.82；再早似乎一时找不到；下载；
非常慢；此网站下载人巨多；
它还有几个看上去是类似站点，GIT、RSYNC的，打开以后看了一阵没看明白；
据说此站点，开源软件的一个镜像站点，可以下；比较快；不过一时没找见；
https://mirror.tuna.tsinghua.edu.cn
从www.kernel.org下很慢；有时下载失败，又从头来；
考虑使用CUrl工具下载；还是慢；但是CUrl支持断点续传；这样断了也可以继续；最终可以下载下来；
全部CMD操作如下；
Microsoft Windows [版本 10.0.17763.1098]
(c) 2018 Microsoft Corporation。保留所有权利。
D:\网络应用软件\curl-7.69.1_1-win64-mingw\curl-7.69.1-win64-mingw\bin>curl -o https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-5.6.2.tar.xz
curl: no URL specified!
curl: try 'curl --help' or 'curl --manual' for more information
D:\网络应用软件\curl-7.69.1_1-win64-mingw\curl-7.69.1-win64-mingw\bin>curl -O https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-5.6.2.tar.xz
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
3 106M 3 3550k 0 0 10^C4 0 3:01:30 0:05:54 2:55:36 12034
D:\网络应用软件\curl-7.69.1_1-win64-mingw\curl-7.69.1-win64-mingw\bin>curl -C - -O https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-5.6.2.tar.xz
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
6 106M 6 7148k 0 0 6241 0 4:58:29 0:19:32 4:38:57 2456
curl: (18) transfer closed with 104456667 bytes remaining to read
D:\网络应用软件\curl-7.69.1_1-win64-mingw\curl-7.69.1-win64-mingw\bin>curl -C - -O https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-5.6.2.tar.xz
** Resuming transfer from byte position 7319621
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
7 99.6M 7 7504k 0 0 6943 0 4:10:44 0:18:26 3:52:18 1041
curl: (18) transfer closed with 96772033 bytes remaining to read
D:\网络应用软件\curl-7.69.1_1-win64-mingw\curl-7.69.1-win64-mingw\bin>curl -C - -O https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-5.6.2.tar.xz
** Resuming transfer from byte position 15004255
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
19 92.2M 19 18.4M 0 0 9894 0 2:43:00 0:32:35 2:10:25 2616
curl: (18) transfer closed with 77425111 bytes remaining to read
D:\网络应用软件\curl-7.69.1_1-win64-mingw\curl-7.69.1-win64-mingw\bin>curl -C - -O https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-5.6.2.tar.xz
** Resuming transfer from byte position 34351177
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 73.8M 100 73.8M 0 0 11044 0 1:56:50 1:56:50 --:--:-- 12408
D:\网络应用软件\curl-7.69.1_1-win64-mingw\curl-7.69.1-win64-mingw\bin>
命令如下；
curl -O https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-5.6.2.tar.xz
curl -C - -O https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-5.6.2.tar.xz
第二条是断点续传；-O要大写；-C和-O之间有个短横线；
下载完成之后如下；
