RRDTOOL

こちらもデフォルトで入ってましたが，案の定

root@void ~ > rrdtool --version
RRDtool 1.0.39  Copyright 1997-2001 by Tobias Oetiker <tobi@oetiker.ch>

Usage: rrdtool [options] command command_options

Valid commands: create, update, graph, dump, restore,
                last, info, fetch, tune, resize, xport

RRDtool is distributed under the Terms of the GNU General
Public License Version 2. (www.gnu.org/copyleft/gpl.html)

For more information read the RRD manpages

(;´Д`)古かった……
さーて，ちゃっちゃと update しちまいますか。