func (u *DefGroup) Exists() (interface{}, error) { _, err := group.LookupGroup(u.groupname) if err != nil { return false, nil } return true, nil }
func (u *DefGroup) Gid() (interface{}, error) { group, err := group.LookupGroup(u.groupname) if err != nil { return "", nil } return group.Gid, nil }