aria2 是 Linux 下一个不错的高速下载工具。由于它具有分段下载引擎，所以支持从多个地址或者从一个地址的多个连接来下载同一个文件。这样自然就大大加快了文件的下载速 度。aria2 也具有断点续传功能，这使你随时能够恢复已经中断的文件下载。除了支持一般的 http(s) 和 ftp 协议外，aria2 还支持 BitTorrent 协议。这意味着，你也可以使用 aria2 来下载 torrent 文件。
安装 aria2
aria2 目前已被包含到许多 Linux 发行版中，因此你可以通过所用的系统直接加以安装。例如，在 Debian/Ubuntu 中，你可以在终端执行如下指令来安装 aria2：
sudo apt-get install aria2
项目页:
http://aria2.sourceforge.net/
aUsage
Download from WEB
$ aria2c http://example.org/mylinux.iso
Download from 2 sources
$ aria2c http://a/f.iso ftp://b/f.iso
BitTorrent
$ aria2c http://example.org/mylinux.torrent
BitTorrent Magnet URI
$ aria2c 'magnet:?xt=urn:btih:248D0A1CD08284299D
E78D5C1ED359BB46717D8C'
Metalink
$ aria2c http://example.org/mylinux.metalink
Download URIs found in text file
$ aria2c -i uris.txt
关于 aria2 的更多用法，可以通过 man aria2c 查阅。
GUI：
推荐使用aria2fe
http://aria2fe.sourceforge.net/
aria2fe需要安装xterm
apt-get install xterm
First Install:
The EASY Way:
Make a copy of the tarball you downloaded (just in case!).
Unpack the tarball to your home directory (~/). This will add a new directory
named aria2fe-0.0.5 (~/aria2fe-0.0.5).
Copy ~/aria2fe-0.0.5/bin/aria2fe (the binary) to ~/bin. Your home "bin"
directory should already be in your path.
Create a desktop icon (or add an entry to your desktop menu). aria2fe logo
icons (22x22 and 32x32) are located in the ~/aria2fe-0.0.5/src/pixmaps
directory. If you prefer, aria2fe can be launched from the command line.
Insure that the aria2 and xterm binaries are installed in your path.
That wasn't too hard now, was it?
Note: If aria2fe fails to launch, check permissions and your lib dependencies.
The HARDER Way:
The only difference here is that you will copy the aria2fe binary to a system
bin directory - and that would be /usr/local/bin. I do not recommend this
approach, however, it is your system. Be aprised that you do so at your own
risk!
Open a terminal, gain root and cp ~/aria2fe-0.0.5/bin/aria2fe /usr/local/bin.
Everything else is the same as the "EASY Way".
The HARDEST Way:
"qmake", "make" and "make install" the project after modifying the .pro file
accordingly.
NOTE: A standalone binary requires a static Qt installation.
If you encounter problems other than those mentioned above, take 2 aspirin,
drink plenty of alcohol, get plenty of rest, and call me in the morning!
有兴趣的朋友可以尝试一下
https://sourceforge.net/projects/aria2web/
还有很多其他的GUI
http://sourceforge.net/apps/trac/aria2/wiki
