updates rrd with bw

RRDFile=/home/db/work/rrdtool/bandwidth.rrdnetwork_interface=nve0while [ 1 ]do        data=`/usr/bin/netstat -ib | /usr/bin/grep $network_interface | /usr/bin/grep Link | /usr/bin/awk '{ print $7":"$10; }'`        /usr/local/bin/rrdtool update $RRDFile "N:$data"        sleep 5done