rTorrent is an efficient, command-line only BitTorrent client that uses the libTorrent library as its underlying engine.
rTorrent can be compiled and run on nearly every POSIX-compliant system, including Linux, FreeBSD and OS X. It is often used in conjunction with GNU Screen or Tmux for remote torrent downloading.
Method 2 : Alternatively, you can use any online magnet link converter to turn it into a torrent file, then load it into rTorrent. Torrent2Magnet by Calpe Consulting is a nice one with simple interface. Please note that you should not use this site for private magnet links, as it makes your magnet publicly available after converting.
Method 3 : ruTorrent allows you to add magnet links easily by pasting the URL into Torrent URL in Add Torrent window.