There are 2 ways to use BitTorrent Sync , 1st Install it using PPA & 2nd Download

1st PPA

sudo add-apt-repository ppa:tuxpoldo/btsync sudo apt-get update sudo apt-get install btsync 

During the installation just use the default setting and set the administrative password as well ,You can access it by

127.0.0.1:8888     # This will redirect to the 2nd link 

OR

http://127.0.0.1:8888/gui/ 

Username = admin , Password = ( Use have set during installation )

2nd Download

Download BitTorrent Sync http://labs.bittorrent.com/experiments/sync.html

cd Downloads tar xzpf btsync_glibc23_x64.tar.gz # I have downloaded 64 bit. So check your version  ./btsync 

The output will be

./btsync  BitTorrent Sync forked to background. pid = 5771  # some what like this pid will be change 

Open any web browser & copy paste the following line

127.0.0.1:8888     # This will redirect to the 2nd link 

OR

http://127.0.0.1:8888/gui/ 

If you type ./btsync --help you can also run it no deamon mode

./btsync --help  BitTorrent Sync 1.0.132  Usage:  btsync [--config ] [--nodaemon] [--generate-secret] [--dump-sample-config] [--help] [--get-ro-secret ]  Options: --config - location and name of configuration file --nodaemon - do not use daemon mode --generate-secret - generate shared secret --get-ro-secret - get read only secret for existing master secret --dump-sample-config - dump sample config file --help - print this message and exit 

Help

forum.bittorrent.com

Video tutorial jupiterbroadcasting.com

Please also have look at Peer To Peer (P2P) Sync and Share Ubuntu