$ aria2c -S ubuntu-14.04.2-desktop-i386.iso.torrent 
>>> Printing the contents of file 'ubuntu-14.04.2-desktop-i386.iso.torrent'...
*** BitTorrent File Information ***
Comment: Ubuntu CD releases.ubuntu.com
Creation Date: Thu, 19 Feb 2015 22:17:32 GMT
Mode: single
Announce:
 http://torrent.ubuntu.com:6969/announce
 http://ipv6.torrent.ubuntu.com:6969/announce
Info Hash: 33678ec8b0dfb8a9061348c8af7194268c0b8310
Piece Length: 512KiB
The Number of Pieces: 2006
Total Length: 0.9GiB (1,051,721,728)
Name: ubuntu-14.04.2-desktop-i386.iso
Magnet URI: magnet:?xt=urn:btih:33678EC8B0DFB8A9061348C8AF7194268C0B8310&dn=ubuntu-14.04.2-desktop-i386.iso&tr=http%3A%2F%2Ftorrent.ubuntu.com%3A6969%2Fannounce&tr=http%3A%2F%2Fipv6.torrent.ubuntu.com%3A6969%2Fannounce
Files:
idx|path/length
===+===========================================================================
  1|./ubuntu-14.04.2-desktop-i386.iso
   |0.9GiB (1,051,721,728)
---+---------------------------------------------------------------------------