# Just download a file
# The url can be a http(s), ftp, .torrent file or even a magnet link
aria2c <url>

# To prevent downloading the .torrent file
aria2c --follow-torrent=mem <url>

# Download 1 file at a time (-j) 
# continuing (-c) any partially downloaded ones
# to the directory specified (-d)
# reading urls from the file (-i)
aria2c -j 1 -c -d ~/Downloads -i /path/to/file