What is Unison?
Unison is a multi-master file-synchronization tool. It allows two replicas of collection of files and directories to be stored on different hosts (or different locations on the same host), modified separately, and then brought up to date by propagating the changes in each replica to the other.
Basic Steps :-
Installation
1.Open your terminal in superuser mode and type "yum search unison"
2.Then you find a proper version of unison and install by using yum install
Configure
1. Then type your unison in terminal.

After that you double click on default then it open like:-

Then you just select which folder or file you want to share and click OK

Now there is many protocol option you can choose any one of them i choose ssh and give the ip address of host computer and the username also after that click OK

if you are using ssh then it ask for authenticity just type yes and click OK

Now it try to connect the host machine.

after connection it ask the host machine password you give the password and configure is done.
And now you are connect to the host machine and easily synchronize your file with your friends computer.

