aria2c [<OPTIONS>] [<URI>|<MAGNET>|<TORRENT_FILE>|<METALINK_FILE>] ...
Aria2是一个轻量级的、支持多种协议的跨平台命令行下载工具。同时支持HTTP(S)、FTP、SFTP、BitTorrent和Metalink协议。 aria2可以从多个来源/协议下载文件，并尝试利用最大下载带宽。 它支持同时从HTTP(S)/FTP/SFTP和BitTorrent下载文件，而从HTTP(S)/ FTP / SFTP下载的数据上传到BitTorrent群。 使用Metalink块校验和，aria2在下载文件时自动验证数据块。
Copyright (C) 2006, 2015 Tatsuhiro Tsujikawa
This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
In addition, as a special exception, the copyright holders give permission to link the code of portions of this program with the OpenSSL library under certain conditions as described in each individual source file, and distribute linked combinations including the two. You must obey the GNU General Public License in all respects for all of the code used other than OpenSSL. If you modify file(s) with this exception, you may extend this exception to your version of the file(s), but you are not obligated to do so. If you do not wish to do so, delete this exception statement from your version. If you delete this exception statement from all source files in the program, then also delete it here.