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Changing the ownership of objects
Finally, we'll need to 
know how to change the ownership of files and directories. It's 
often the case that a particular user needs to gain access to an object, or perhaps we 
need to change the owning group as well. We can change user and group ownership 
of a file or directory with the 
chown
 command. As an example, if we wanted to 
change the owner of a file to 
sue
, we could do the following:
sudo chown sue myfile.txt 
In the case of a directory, we can also use the 
-R
 flag to change the ownership of the 
directory itself, as well as all the files and directories it may contain:
sudo chown -R sue mydir 
If we would like to change the group assignment to the object, we would follow the 
following syntax:
sudo chown sue:sales myfile.txt 
Notice the colon separating the user and the group. With that command, we 
established that we would like the 
sue
 user and the 
sales
 group to own this 
resource. Again, we could use 
-R
 if the object were a directory and we wanted to 
make the changes recursive.

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Managing Users and Permissions