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translating---geekpi
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How to use lftp to accelerate ftp/https download speed on Linux/UNIX
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======
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lftp is a file transfer program. It allows sophisticated FTP, HTTP/HTTPS, and other connections. If the site URL is specified, then lftp will connect to that site otherwise a connection has to be established with the open command. It is an essential tool for all a Linux/Unix command line users. I have already written about [Linux ultra fast command line download accelerator][1] such as Axel and prozilla. lftp is another tool for the same job with more features. lftp can handle seven file access methods:
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1. ftp
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2. ftps
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3. http
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4. https
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5. hftp
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6. fish
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7. sftp
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8. file
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### So what is unique about lftp?
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* Every operation in lftp is reliable, that is any not fatal error is ignored, and the operation is repeated. So if downloading breaks, it will be restarted from the point automatically. Even if FTP server does not support REST command, lftp will try to retrieve the file from the very beginning until the file is transferred completely.
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* lftp has shell-like command syntax allowing you to launch several commands in parallel in the background.
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* lftp has a builtin mirror which can download or update a whole directory tree. There is also a reverse mirror (mirror -R) which uploads or updates a directory tree on the server. The mirror can also synchronize directories between two remote servers, using FXP if available.
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### How to use lftp as download accelerator
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lftp has pget command. It allows you download files in parallel. The syntax is
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`lftp -e 'pget -n NUM -c url; exit'`
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For example, download <http://kernel.org/pub/linux/kernel/v2.6/linux-2.6.22.2.tar.bz2> file using pget in 5 parts:
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```
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$ cd /tmp
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$ lftp -e 'pget -n 5 -c http://kernel.org/pub/linux/kernel/v2.6/linux-2.6.22.2.tar.bz2'
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```
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Sample outputs:
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```
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45108964 bytes transferred in 57 seconds (775.3K/s)
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lftp :~>quit
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```
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Where,
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1. pget – Download files in parallel
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2. -n 5 – Set maximum number of connections to 5
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3. -c – Continue broken transfer if lfile.lftp-pget-status exists in the current directory
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### How to use lftp to accelerate ftp/https download on Linux/Unix
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Another try with added exit command:
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`$ lftp -e 'pget -n 10 -c https://cdn.kernel.org/pub/linux/kernel/v4.x/linux-4.15.tar.xz; exit'`
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[Linux-lftp-command-demo][https://www.cyberciti.biz/tips/wp-content/uploads/2007/08/Linux-lftp-command-demo.mp4]
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### A note about parallel downloading
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Please note that by using download accelerator you are going to put a load on remote host. Also note that lftp may not work with sites that do not support multi-source downloads or blocks such requests at firewall level.
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NA command offers many other features. Refer to [lftp][2] man page for more information:
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`man lftp`
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### about the author
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The author is the creator of nixCraft and a seasoned sysadmin and a trainer for the Linux operating system/Unix shell scripting. He has worked with global clients and in various industries, including IT, education, defense and space research, and the nonprofit sector. Follow him on [Twitter][3], [Facebook][4], [Google+][5]. Get the **latest tutorials on SysAdmin, Linux/Unix and open source topics via[my RSS/XML feed][6]**.
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--------------------------------------------------------------------------------
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via: https://www.cyberciti.biz/tips/linux-unix-download-accelerator.html
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作者：[Vivek Gite][a]
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译者：[译者ID](https://github.com/译者ID)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]:https://www.cyberciti.biz
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[1]:https://www.cyberciti.biz/tips/download-accelerator-for-linux-command-line-tools.html
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[2]:https://lftp.yar.ru/
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[3]:https://twitter.com/nixcraft
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[4]:https://facebook.com/nixcraft
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[5]:https://plus.google.com/+CybercitiBiz
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[6]:https://www.cyberciti.biz/atom/atom.xml
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@ -0,0 +1,81 @@
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如何使用 lftp 来加速 Linux/UNIX 上的 ftp/https 下载速度
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======
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lftp 是一个文件传输程序。它可以用复杂的 FTP, HTTP/HTTPS 和其他连接。如果指定了站点 URL，那么 lftp 将连接到该站点，否则会使用 open 命令建立连接。它是所有 Linux/Unix 命令行用户的必备工具。我目前写了一些关于[ Linux 下超快命令行下载加速器][1]，比如 Axel 和 prozilla。lftp 是另一个能做相同的事，但有更多功能的工具。lftp 可以处理七种文件访问方式：
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1. ftp
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2. ftps
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3. http
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4. https
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5. hftp
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6. fish
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7. sftp
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8. file
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### 那么 lftp 的独特之处是什么？
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* lftp 中的每个操作都是可靠的，即任何非致命错误都被忽略，并且重复操作。所以如果下载中断，它会自动重新启动。即使 FTP 服务器不支持 REST 命令，lftp 也会尝试从开头检索文件，直到文件传输完成。
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* lftp 具有类似 shell 的命令语法，允许你在后台并行启动多个命令。
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* lftp 有一个内置镜像，可以下载或更新整个目录树。还有一个反向镜像（mittor -R），它可以上传或更新服务器上的目录树。镜像也可以在两个远程服务器之间同步目录，如果可用的话会使用 FXP。
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### 如何使用 lftp 作为下载加速器
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lftp 有 pget 命令。它能让你并行下载。语法是：
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`lftp -e 'pget -n NUM -c url; exit'`
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例如，使用 pget 分 5个部分下载 <http://kernel.org/pub/linux/kernel/v2.6/linux-2.6.22.2.tar.bz2>：
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```
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$ cd /tmp
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$ lftp -e 'pget -n 5 -c http://kernel.org/pub/linux/kernel/v2.6/linux-2.6.22.2.tar.bz2'
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```
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示例输出：
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```
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45108964 bytes transferred in 57 seconds (775.3K/s)
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lftp :~>quit
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```
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这里：
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1. pget - 并行下载文件
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2. -n 5 - 将最大连接数设置为 5
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3. -c - 如果当前目录存在 lfile.lftp-pget-status，则继续中断的传输
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### 如何在 Linux/Unix 中使用 lftp 来加速 ftp/https下载
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再尝试添加退出命令：
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`$ lftp -e 'pget -n 10 -c https://cdn.kernel.org/pub/linux/kernel/v4.x/linux-4.15.tar.xz; exit'`
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[Linux-lftp-command-demo][https://www.cyberciti.biz/tips/wp-content/uploads/2007/08/Linux-lftp-command-demo.mp4]
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### 关于并行下载的说明
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请注意，通过使用下载加速器，你将增加远程服务器负载。另请注意，lftp 可能无法在不支持多点下载的站点上工作，或者防火墙阻止了此类请求。
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NA 命令提供了许多其他功能。有关更多信息，请参考 [lftp][2] 的 man 页面：
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`man lftp`
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### 关于作者
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作者是 nixCraft 的创建者，经验丰富的系统管理员，也是 Linux 操作系统/Unix shell 脚本的培训师。他曾与全球客户以及IT、教育、国防和太空研究以及非营利部门等多个行业合作。在 [Twitter][9]、[Facebook][10]、[Google +][11] 上关注他。通过[我的 RSS/XML 订阅][5]获取**最新的系统管理、Linux/Unix 以及开源主题教程**。
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--------------------------------------------------------------------------------
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via: https://www.cyberciti.biz/tips/linux-unix-download-accelerator.html
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作者：[Vivek Gite][a]
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译者：[geekpi](https://github.com/geekpi)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]:https://www.cyberciti.biz
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[1]:https://www.cyberciti.biz/tips/download-accelerator-for-linux-command-line-tools.html
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[2]:https://lftp.yar.ru/
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[3]:https://twitter.com/nixcraft
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[4]:https://facebook.com/nixcraft
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[5]:https://plus.google.com/+CybercitiBiz
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[6]:https://www.cyberciti.biz/atom/atom.xml
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