3. Ownership Permissions

In addition to modifying permissions on files, you can also modify the group and user ownership of the file as well.

Modify user ownership

$ sudo chown patty myfile

This command will set the owner of myfile to patty.

Modify group ownership

$ sudo chgrp whales myfile

This command will set the group of myfile to whales.

Modify both user and group ownership at the same time
If you add a colon and groupname after the user you can set both the user and group at the same time.

$ sudo chown patty:whales myfile