ADSL Usage checker update

I took some time today to revamp the ADSL usage checking script I wrote some time ago and added a few more features like the ability to output more detailed information.

I added a few more options like the ability to customize the output string, check for updates, and so on and so forth. Here's the updated script. It's a bit lengthy...

#!/bin/bash
##################################################
# Ugly Dirty yet functional script to check ADSL
# usage statistics for Dhiraagu subscribers.
# 
# type ./dslusage -h for options
#
# This script is provided as is, without liabilities
# or guarantee.
#
# 2010 KudaNai - http://kudanai.blogspot.com
#-------------------------------------------------


username= #your login name
password= #your password here
package_allowance=20 #must be specified
version=0.2

#End of configuration section.
PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
fmtstring="DSL Usage:\tGBUSEDGb / GBALLOWGb ( GBLEFTGb remaining)" #Default format string

function pusage() {
 echo -e "\tUSEAGE: ${0} "
 cat ${0} | tail -n 23 | sed "s/#//g;s/VERSION/${version}/g"
 exit
}

function error() {
 echo -e "ERROR: $1\n"
 if [ -z $2 ];then pusage;fi
 exit
}
function checkupdate() {
 if [ -z $(which curl) ];then error "This functionality requires cURL. Please install it and try again" 1;fi
 local ver=$(curl --silent http://dl.dropbox.com/u/5385653/ddslcheck/ver)
 if [ $(expr ${ver} \> ${version}) -eq 1 ]
 then 
  echo "A newer version ${ver} is available online."
 else
  echo "You are probably using the latest version."
 fi
}

while getopts 'vVUhu:p:f:' OPTION
do
 case $OPTION in
  u) username=${OPTARG};;
  p) password=${OPTARG};;
  a) package_allowance=${OPTARG};;
  v) fmtstring="Dhiraagu ADSL Usage Details as on\n`date`\n\nCustomer:\tSUBSCRIBER (USERID)\nPackage:\tPACKAGE_NAME\nusage period:\tBILLING_START to BILLING_END (BILLING_CYCLE)\n\nDSL Usage:\tGBUSEDGb / GBALLOWGb ( GBLEFTGb remaining)";;
  V) cat $0 | tail -n 5 | sed "s/#//g;s/VERSION/${version}/g";exit;;
  f) fmtstring=${OPTARG};;
  U) checkupdate;exit;;
  h) pusage;;
  ?) pusage;;
 esac
done

if [ -z $(which img2txt) ]; then error "You need to install caca-utils before proceeding" 1;exit;fi
if [ -z $(which wget) ];then error "You don't have wget installed...seriously?" 1;exit;fi
if [[ -z ${username} || -z ${password} || -z ${package_allowance} ]]; then error "You need to specify username and password";fi

cd /tmp # ---------------here on down everything is done inside temp
wget --quiet --no-cache --post-data "web_user=${username}&web_pass=${password}" -p http://dsl.dhivehinet.net.mv/login.php
if [ ! -f "dsl.dhivehinet.net.mv/comparision_graph.php" ];then error "Invalid username/password" 1;fi

OIFS="{$IFS}"; IFS=$'\n'
count=0
for LINE in $(sed -n 's/.*"#000080" size="2">\([^<]*\).*/\1/p' dsl.dhivehinet.net.mv/topframe.php;sed -n 's/.*through \(.*\) to \([^<]*\)<.*/\1\n\2/p' dsl.dhivehinet.net.mv/comparision_tpl.php)
do
 ARR[${count}]=$LINE
 ((count++))
done
IFS="${OIFS}"

gstring=$(img2txt -H 400 -W 4 -d none -f ansi dsl.dhivehinet.net.mv/comparision_graph.php)
gtotal=$(echo "${gstring}" | grep 44 | wc -l)
gused=$(echo "${gstring}" | grep 43 | wc -l)
gbused=$(echo "scale=3;${gused} / ${gtotal} * ${package_allowance}" | bc -l)
gbleft=$(echo "scale=3;${package_allowance} - ${gbused}" | bc -l)

echo -e "${fmtstring}" | sed "s/SUBSCRIBER/${ARR[0]}/g;s/USERID/${ARR[1]}/g;s/PACKAGE_NAME/${ARR[2]}/g;s/BILLING_CYCLE/${ARR[3]}/g;s/BILLING_START/${ARR[4]}/g;s/BILLING_END/${ARR[5]}/g;s/GBUSED/${gbused}/g;s/GBLEFT/${gbleft}/g;s/GBALLOW/${package_allowance}/g;"

rm -r dsl.dhivehinet.net.mv
#
#OPTIONS:
# -a Specify package allowance for limited connections.
# -f Define custom format string.
# -h Print this help.
# -p Specify password.
# -u Specify username.
# -U Check for updates.
# -v Verbose output. Print more details.
# -V print version information and exit.
#
#FORMATTING:
# The format string can by anything containing any of the following
# special variables which will be substituted with appropriate values.
# use \n,\t for newlines and tabs.
#
# SUBSCRIBER,USERID,PACKAGE_NAME,BILLING_CYCLE 
# BILLING_START,BILLING_END,GBUSED,GBLEFT,GBALLOW
#
# Dhiraagu DSLUsage checker
# 2010 - KudaNai [ http://kudanai.blogspot.com ]
# vVERSION
#