This file contains a list of groups and their members. <AuthBy FILE> uses these groups and the group file is defined with GroupFilename parameter. For more information, see Section 3.35.2. GroupFilename.

The format of group membership file has first the name of the group and then a comma-separated list of users that belong to that group. One user can belong to one or several groups.

Here is an example of a group membership file:

Admin-group username1

WiFiClient-group username1, username2, username3

Readonly-group username4, username5