Assume the Primary Administrator role, or become superuser.
$ chgrp scifi example-file
For information on setting up groups, see Chapter 4, Managing User Accounts and Groups (Overview), in System Administration Guide: Basic Administration.
Verify that the group ownership of the file has changed.
$ ls -l example-file -rw-r--r-- 1 stacey scifi 112640 June 20 08:55 example-file
Also see Example 6–2.