Aria2 – A Multi-Protocol Command-Line Download Tool for Linux

Aria2 is a lightweight, multi-protocol command-line download utility for Linux that supports HTTP, HTTPS, FTP, BitTorrent, and Metalink protocols. Unlike graphical download managers, Aria2 operates through terminal commands, offering superior control, efficiency, and resource management for downloading files from various sources.

Key Features

Aria2 stands out with its multi-connection downloads, allowing files to be split into segments and downloaded simultaneously from multiple sources. It supports resumable downloads, automatically continuing interrupted transfers without losing progress. The tool also provides checksum verification to ensure file integrity and offers detailed download statistics including speed, progress, and connection information.

Installation

Aria2 is available in most Linux distribution repositories. Install it using your system's package manager:

# Ubuntu/Debian
sudo apt-get install aria2

# CentOS/RHEL
sudo yum install aria2

# Fedora
sudo dnf install aria2

# Arch Linux
sudo pacman -S aria2

Basic Download Operations

Single File Download

Download a file by specifying its URL:

aria2c https://example.com/file.iso

Multiple File Downloads

Create a text file with URLs (one per line) and use the -i option:

# Create URLs file
echo "https://example.com/file1.zip" > downloads.txt
echo "https://example.com/file2.tar.gz" >> downloads.txt

# Download all files
aria2c -i downloads.txt

Protocol-Specific Features

BitTorrent Downloads

Download torrents by specifying the .torrent file or magnet link:

# Using torrent file
aria2c -d ~/Downloads ubuntu-20.04.3-desktop-amd64.iso.torrent

# Using magnet link
aria2c "magnet:?xt=urn:btih:..."

Metalink Support

Metalink files contain multiple download sources, enabling faster downloads:

aria2c https://example.com/file.metalink

Advanced Configuration Options

Remote Control and Web Interface

Aria2 can run as a daemon with RPC support, enabling remote control through a web interface:

# Start aria2 RPC server
aria2c --enable-rpc --rpc-listen-all

# With authentication
aria2c --enable-rpc --rpc-secret=mypassword --rpc-listen-all

Access the web interface at http://localhost:6800 using compatible web UIs like AriaNg or webui-aria2.

Download Control and Monitoring

Control active downloads using keyboard shortcuts:

• Ctrl + C Pause download (can be resumed)

• Ctrl + Z Suspend process

Monitor download progress with real-time statistics including current speed, ETA, active connections, and completion percentage.

Advantages

• Low resource usage Minimal CPU and memory consumption

• Cross-platform compatibility Available on Linux, Windows, and macOS

• Segmented downloading Splits files for parallel downloading

• Protocol versatility Supports multiple download protocols

• Resumable transfers Automatic recovery from interruptions

Conclusion

Aria2 is an exceptionally powerful command-line download manager that combines multi-protocol support with advanced features like segmented downloads and remote control. Its lightweight design and extensive configuration options make it ideal for both casual users and system administrators who need reliable, efficient file downloading capabilities.