Console Bandwidth Monitoring?

[Warren Togami <warren@togami.com>]

We have hacked together this script below in order to monitor our
current bandwidth usage on our public FTP server.  Unfortunately, it
appears to be gravely inaccurate.  Does anyone have a better method that
is accurate?  I wish to know my bandwidth usage in bytes/sec.

#!/bin/zsh

if [ $# -eq 0 ]; then
    echo "$0 <interface>"
    exit
fi

clear
BYTES_RECEIVED=$(cat /proc/net/dev | grep $1 | awk '{print $9}')
BYTES_SENT=$(cat /proc/net/dev | grep $1 | awk -F: '{print $2}' | awk
'{print $1}')

echo "Bytes Received: $BYTES_RECEIVED"
echo "Bytes Sent: $BYTES_SENT"

if [ $# -gt 1 ]; then
    echo "Receiving: $(( $BYTES_RECEIVED - $2 ))B/sec"
    echo "Sending: $(( $BYTES_SENT - $3))B/sec"
fi
sleep 1
exec $0 $1 $BYTES_RECEIVED $BYTES_SENT
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