#!/bin/sh
URL='http://repos.lax-noc.com/speedtests/100mb.bin'
TIME1="$( date +%s )"
wget -qO /dev/null "$URL"
TIME2="$( date +%s )"
DIFF=$(( TIME2 - TIME1 ))
SPEED=$(( (100 * 1024) / DIFF ))

echo $SPEED   # kilobytes/sec