aria2 is a lightweight multi-protocol & multi-source command-line download utility. It supports HTTP/HTTPS, FTP, BitTorrent and Metalink. aria2 can be manipulated via built-in JSON-RPC and XML-RPC interfaces.

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Features

Multi-Connection Download

aria2 can download a file from multiple sources/protocols and tries to utilize your maximum download bandwidth. Really speeds up your download experience.

Lightweight

aria2 doesn't require much memory and CPU time. The physical memory usage is typically 4MiB (normal HTTP/FTP downloads) to 9MiB (BitTorrent downloads). CPU usage in BitTorrent with download speed of 2.8MiB/sec is around 6%.

Fully Featured BitTorrent Client

All features you want in BitTorrent client are available: DHT, PEX, Encryption, Magnet URI, Web-Seeding, Selective Downloads and Local Peer Discovery.

Metalink Enabled

aria2 supports The Metalink Download Description Format(aka Metalink v4) and Metalink/HTTP. Old Metalink v3 is also supported. Metalink offers File verification, HTTP/FTP/BitTorrent integration and Configuration for language, location, OS, etc.

Remote Control

aria2 supports RPC interface to control the aria2 process. The supported interfaces are JSON-RPC (over HTTP and WebSocket) and XML-RPC.

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Usage

Command-line scares you off? No, aria2 is really easy to use!!

Download from WEB

$ aria2c http://example.org/mylinux.iso

Download from 2 sources

$ aria2c http://a/f.iso ftp://b/f.iso

Download using 2 connections per host

$ aria2c -x2 http://a/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
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License

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.