[cobalt-users] Existing ownership for directory with chown

["Tunc Eresen\(?`..,,.-> Cobalt M447785363481 " <tunceresen@xxxxxxxxxx>]

Hello all 

I would like to add a user which will update ownership of the directory and
files for one additional user

Here is what I will do  
chown -fR username  /home/sites/www.domain.com/web/osc/* 
 Is it correct? Will it remove existing ownership? 
And  how do I reverse it? 

My Unix 101 useless.

Thanks 

Tunc