user/group.go
func AddSystemGroup(name string, members ...string) (gid int, err error) {
	s := NewGShadow(name, members...)
	if err = s.Add(nil); err != nil {
		return
	}

	return NewSystemGroup(name, members...).Add()
}
func AddSystemGroup(name string, members ...string) (gid int, err error) {
	s := NewGShadow(name, members...)
	if err = s.Add(nil); err != nil {
		return
	}

	return NewSystemGroup(name, members...).Add()
}
// AddSystemGroup adds a system group.