Speed test shell script

input_urls

http://cdimage.debian.org/debian-cd/6.0.6/i386/iso-cd/debian-6.0.6-i386-netinst.iso
http://mirror.ufs.ac.za/linuxmint//stable/14/linuxmint-14-cinnamon-dvd-64bit.iso
http://cdimage.debian.org/debian-cd/6.0.6/amd64/iso-dvd/debian-6.0.6-amd64-DVD-1.iso

speedtest.sh

#!/bin/bash
## Speedtest script
## Copyright (C) 2012 Jishnu Mohan <jishnu7@gmail.com>
## Last revised 28-Nov-2012
##
## Usage: speedtest <input file> <output file>
##
## This script takes list of URLs from input text file and outputs 
## speed and time it took to access each file/URL

if [ $1 ]
then
    FILENAME=$1
else
    echo "Usage: speedtest <input file> <output file>"
    exit 0
fi

if [ $2 ]
then
    OUTPUT=$2
else
    OUTPUT="output"
fi

rm -f $OUTPUT
echo -e "URL\tSize(bytes)\tSpeed(bytes/s)\tTime(s)" >> $OUTPUT

counter=0

findspeed () {
    local url=$1
    curl -w $url'\t%{size_download}\t%{speed_download}\t%{time_total}\n' -o /dev/null -s $url >> $OUTPUT
    counter=`expr $counter + 1`
    echo -ne "Number of URLs tested: $counter\r"
    }

while read line
do
    findspeed $line
done < "$FILENAME"

column -t "$OUTPUT"