List returns a list of all group entries on the system.

Lookup looks up a group by its name.

LookupId looks up a group by its gid.

LookupUId returns a list of groups a given userid is associated with.If the no groups can be found, the error is of type user.UnknownUserIdError.

LookupUser returns a list of groups a given username is associated with.If the no groups can be found, the error is of type user.UnknownUserError.

Group represents a group entry.

UnknownGroupError is returned by Lookup when a group cannot be found.

UnknownGroupIdError is returned by LookupId when a group cannot be found.