user/group.go
func LookupGID(gid int) (*Group, error) {
	entries, err := LookupInGroup(G_GID, gid, 1)
	if err != nil {
		return nil, err
	}

	return entries[0], err
}
func LookupGID(gid int) (*Group, error) {
	entries, err := LookupInGroup(G_GID, gid, 1)
	if err != nil {
		return nil, err
	}

	return entries[0], err
}
// LookupGID looks up a group by group ID.