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#!/bin/bash
#
# netload
# written by Jan Engelhardt, 2002-2007
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the WTF Public License version 2 or
# (at your option) any later version.
#
# NOTE: This script uses /proc/net/dev. Note that TX counters are NOT updated
# for vmnet-bridge traffic!
#
if [ -z "$1" ]; then
echo "Usage: $0 <device> [interval]";
exit 1;
fi
if [ -z "$2" ]; then
sleeper=sleep;
wait=1;
elif [ "$2" -ge 50000 ]; then
sleeper=usleep;
wait="$2";
else
sleeper=sleep;
wait="$2";
fi;
while :; do
cat /proc/net/dev | grep " $1" | cut -f 2 -d:;
"$sleeper" $wait;
done | perl -pe '$|=1;s/.*://' | while read rxcnt rxpkt c d e f g h txcnt txpkt; do
if [ "$all" != "" ]; then
now="`cat /proc/uptime | cut -f 1 -d " " | sed s/"\."//g`";
[ $[$now-$oldtm] -eq 0 ] && continue;
rxbytes=$[($rxcnt-$oldrx)*100/($now-$oldtm)];
rxint=$[$rxbytes/1024];
rxfrac=$[$rxbytes-($rxbytes/1024*1024)];
txbytes=$[($txcnt-$oldtx)*100/($now-$oldtm)];
txint=$[$txbytes/1024];
txfrac=$[$txbytes-($txbytes/1024*1024)];
printf "\r\e[2K"" IN: %9d.%03d KB/s OUT: %9d.%03d KB/s" \
$rxint $rxfrac $txint $txfrac;
fi;
all=$[$rxcnt+$txcnt];
oldrx=$rxcnt;
oldtx=$txcnt;
oldtm="`cat /proc/uptime | cut -f 1 -d " " | sed s/"\."//g`";
done;
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