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[share] example, this section will cover some common options. 4.3.1. Groups
Groups define a collection of computers or users which have a common level of access to particular network resources and offer a level of granularity in controlling access to such resources. For example, if a group qa is defined and contains the users freda, danika, and rob and a second group support is defined and consists of users danika, jeremy, and vincent then certain network resources configured to allow access by the qa group will subsequently enable access by freda, danika, and rob, but not jeremy or vincent. Since the user danika belongs to both the qa and support groups, she will be able to access resources configured for access by both groups, whereas all other users will have only access to resources explicitly allowing the group they are part of.
By default Samba looks for the local system groups defined in /etc/group to determine which users belong to which groups. For more information on adding and removing users from groups see Section 1.2, “Adding and Deleting Users” [p. 181].
When defining groups in the Samba configuration file, /etc/samba/smb.conf, the recognized syntax is to preface the group name with an "@" symbol. For example, if you wished to define a group named sysadmin in a certain section of the /etc/samba/smb.conf, you would do so by entering the group name as @sysadmin.