Install EPEL Repository on CentOS 6 64-bit:
rpm -ivh http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm
Install Transmission:
yum -y install transmission-cli
Download a Magnet Link:
transmission-cli -D -w ./ magnet:?xt=urn:btih:824B5Fxxxxxx
Download a Torrent File:
transmission-cli -D -w ./ t.torrent #torrent is the torrent file