UNIX for Dummies Questions & Answers

i want to do file synchronisation...its a client-server model..have to do system call 'ls -l' in both client and server ..the server has to keeep track of client files and have to keep a back up of client files..and tracking must be done based on time stamp..
suppose if client contains a file a.txt and if it is modified @ 2pm...and server also has a.txt whose time stamp is 1pm(means earlier than client)..then the server hav to copy the a.txt and store in backup...
i tried ls -l and stored both server and client files in two diff files...now how will i do synchronisation?can any1 pls help me.....

try in server i suppose user is root

Code:

 
# rsync -av -e "ssh -l root" remoteclient:/client_path/test /server_path/test

thank u so much..4 giving the idea...it helped me alot