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-
-A File Transfer Utility To Download Only The New Parts Of A File
-======
-
-![](https://www.ostechnix.com/wp-content/uploads/2018/02/Linux-1-720x340.png)
-
-Just because Internet plans are getting cheaper every day, you shouldn’t waste your data by repeatedly downloading the same stuff over and over. The one fine example is downloading development version of Ubuntu or any Linux images. As you may know, Ubuntu developers releases daily builds, alpha, beta ISO images every few months for testing. In the past, I used to download those images whenever they are available to test and review each edition. Not anymore! Thanks to **Zsync** file transfer program. Now it is possible to download only the new parts of the ISO image. This will save you a lot of time and Internet bandwidth. Not just time and bandwidth, it will save you the resources on server side and client side.
-
-Zsync uses the same algorithm as **Rsync** , but it only download the new parts of a file that you have a copy of an older version of the file on your computer already. Rsync is mainly for synchronizing data between computers, whereas Zsync is for distributing data. To put this simply, the one file on a central location can be distributed to thousands of downloaders using Zsync. It is completely free and open source released under the Artistic License V2.
-
-### Installing Zsync
-
-Zsync is available in the default repositories of most Linux distributions.
-
-On **Arch Linux** and derivatives, install it using command:
-```
-$ sudo pacman -S zsync
-
-```
-
-On **Fedora** :
-
-Enable Zsync repository:
-```
-$ sudo dnf copr enable ngompa/zsync
-
-```
-
-And install it using command:
-```
-$ sudo dnf install zsync
-
-```
-
-On **Debian, Ubuntu, Linux Mint** :
-```
-$ sudo apt-get install zsync
-
-```
-
-For other distributions, you can download the binary from the [**Zsync download page**][1] and manually compile and install it as shown below.
-```
-$ wget http://zsync.moria.org.uk/download/zsync-0.6.2.tar.bz2
-$ tar xjf zsync-0.6.2.tar.bz2
-$ cd zsync-0.6.2/
-$ configure
-$ make
-$ sudo make install
-
-```
-
-### Usage
-
-Please be mindful that **zsync is only useful if people offer zsync downloads**. Currently, Debian, Ubuntu (all flavours) ISO images are available as .zsync downloads. For example, visit the following link.
-
-As you may noticed, Ubuntu 18.04 LTS daily build is available as direct ISO and .zsync file. If you download .ISO file, you have to download the full ISO whenever the ISO gets new updates. But, if you download .zsync file, the Zsync will download only the new changes in future. You don’t need to download the whole ISO image each time.
-
-A .zsync file contains a meta-data needed by zsync program. This file contains the pre-calculated checksums for the rsync algorithm; it is generated on the server, once, and is then used by any number of downloaders. To download a .zsync file using Zsync client program, all you have to do:
-```
-$ zsync <.zsync-file-URL>
-
-```
-
-Example:
-```
-$ zsync http://cdimage.ubuntu.com/ubuntu/daily-live/current/bionic-desktop-amd64.iso.zsync
-
-```
-
-If you already have the old image file on your system, Zsync will calculate the difference between the old and new file in the remote server and download only the new parts. You will see the calculation process as a series of dots or stars on your Terminal.
-
-If there is an old version of the file you’re just downloading is available in the current working directory, Zsync will download only the new parts. Once the download is finished, you will get two images, the one you just downloaded and the old image with **.iso.zs-old** extension on its filename.
-
-If there is no relevent local data found, Zsync will download the whole file.
-
-![](http://www.ostechnix.com/wp-content/uploads/2018/02/Zsync-1.png)
-
-You can cancel the download process at any time by pressing **CTRL-C**.
-
-Just imagine if you use the direct .ISO file or torrent, you will lose around 1.4GB bandwidth whenever you download new image. So, instead of downloading entire alpha, beta and daily build images, Zsync just downloads the new parts of the ISO file that you already have a copy of an older version of it on your system.
-
-And, that’s all for today. Hope this helps. I will be soon here with another useful guide. Until then stay tuned with OSTechNix!
-
-Cheers!
-
-
-
---------------------------------------------------------------------------------
-
-via: https://www.ostechnix.com/zsync-file-transfer-utility-download-new-parts-file/
-
-作者：[SK][a]
-译者：[译者ID](https://github.com/译者ID)
-校对：[校对者ID](https://github.com/校对者ID)
-
-本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
-
-[a]:https://www.ostechnix.com/author/sk/
-[1]:http://zsync.moria.org.uk/downloads
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+一个仅下载文件新的部分的传输工具
+======
+
+![](https://www.ostechnix.com/wp-content/uploads/2018/02/Linux-1-720x340.png)
+
+仅仅因为网费每天变得越来越便宜，你也不应该重复下载相同的东西来浪费你的流量。一个很好的例子就是下载 Ubuntu 或任何 Linux 镜像的开发版本。如你所知，Ubuntu 开发人员每隔几个月就会发布一次日常构建、alpha、beta 版 ISO 镜像以供测试。在过去，一旦发布我就会下载这些镜像，并审查每个版本。现在不用了！感谢 **Zsync** 文件传输程序。现在可以仅下载 ISO 镜像新的部分。这将为你节省大量时间和 Internet 带宽。不仅时间和带宽，它将为你节省服务端和客户端的资源。
+
+Zsync 使用与 **Rsync**  相同​​的算法，但它只下载文件的新部分，你会得到一份已有文件旧版本的副本。 Rsync 主要用于在计算机之间同步数据，而 Zsync 则用于分发数据。简单地说，可以使用 Zsync 将中心的一个文件分发给数千个下载者。它在 Artistic License V2 许可证下发布，完全免费且开源。
+
+### 安装 Zsync
+
+Zsync 在大多数 Linux 发行版的默认仓库中有。
+
+在 **Arch Linux** 及其衍生版上，使用命令安装它：
+```
+$ sudo pacman -S zsync
+
+```
+
+在 **Fedora** 上：
+
+启用 Zsync 仓库：
+```
+$ sudo dnf copr enable ngompa/zsync
+
+```
+
+并使用命令安装它：
+```
+$ sudo dnf install zsync
+
+```
+
+在 **Debian、Ubuntu、Linux Mint** 上：
+```
+$ sudo apt-get install zsync
+
+```
+
+对于其他发行版，你可以从 [**Zsync 下载页面**][1]下载二进制文件，并手动编译安装它，如下所示。
+```
+$ wget http://zsync.moria.org.uk/download/zsync-0.6.2.tar.bz2
+$ tar xjf zsync-0.6.2.tar.bz2
+$ cd zsync-0.6.2/
+$ configure
+$ make
+$ sudo make install
+
+```
+
+### 用法
+
+请注意，**只有当人们提供 zsync 下载时，zsync 才有用**。目前，Debian、Ubuntu（所有版本）的 ISO 镜像都可以用 .zsync 下载。例如，请访问以下链接。
+
+你可能注意到，Ubuntu 18.04 LTS 每日构建版有直接的 ISO 和 .zsync 文件。如果你下载 .ISO 文件，则必须在 ISO 更新时下载完整的 ISO 文件。但是，如果你下载的是 .zsync 文件，那么 Zsync 将在未来仅下载新的更改。你不需要每次都下载整个 ISO 映像。
+
+.zsync 文件包含 zsync 程序所需的元数据。该文件包含 rsync 算法的预先计算的校验和。它在服务器上生成一次，然后由任意数量的下载器使用。要使用 Zsync 客户端程序下载 .zsync 文件，你只需执行以下操作：
+```
+$ zsync <.zsync-file-URL>
+
+```
+
+例如：
+```
+$ zsync http://cdimage.ubuntu.com/ubuntu/daily-live/current/bionic-desktop-amd64.iso.zsync
+
+```
+
+如果你的系统中已有以前的镜像文件，那么 Zsync 将计算远程服务器中旧文件和新文件之间的差异，并仅下载新的部分。你将在终端看见计算过程一系列的点或星星。
+
+如果你下载的文件的旧版本存在于当前工作目录，那么 Zsync 将只下载新的部分。下载完成后，你将看到两个镜像，一个你刚下载的镜像和以 **.iso.zs-old** 为扩展名的旧镜像。
+
+如果没有找到相关的本地数据，Zsync 会下载整个文件。
+
+![](http://www.ostechnix.com/wp-content/uploads/2018/02/Zsync-1.png)
+
+你可以随时按 **CTRL-C** 取消下载过程。
+
+试想一下，如果你直接下载 .ISO 文件或使用 torrent，每当你下载新镜像时，你将损失约 1.4GB 流量。因此，Zsync 不会下载整个 Alpha、beta 和日常构建映像，而只是在你的系统上下载了 ISO 文件的新部分，并在系统中有一个旧版本的拷贝。
+
+今天就到这里。希望对你有帮助。我将很快另外写一篇有用的指南。在此之前，请继续关注 OSTechNix！
+
+干杯!
+
+
+
+--------------------------------------------------------------------------------
+
+via: https://www.ostechnix.com/zsync-file-transfer-utility-download-new-parts-file/
+
+作者：[SK][a]
+译者：[geekpi](https://github.com/geekpi)
+校对：[校对者ID](https://github.com/校对者ID)
+
+本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
+
+[a]:https://www.ostechnix.com/author/sk/
+[1]:http://zsync.moria.org.uk/downloads