Tool to get traffic statistic from Internet provider Vesso-Bel (BY) using curl [v.0.2.1.1]

vessobel.sh

#!/bin/bash

HLPARG=--help
KDEARG=--kde
ERR='" либо eMail="" не найден'
OUT='Unknown error!'

if [ "`echo $@ | grep -o -- $HLPARG`" == $HLPARG ]
then
  OUT="Tool to get traffic statistic from Internet provider Vesso-Bel (Belarus).\n\n\
Usage: vessobel.sh [LOGIN] [OPTION]\n\n\
Output: [Used in MB] / [Free in MB] | [Amount of payment in belarusian rubles]\n\n\
Options:\n\t--help\t\tprint this help.\n\
\t--kde\t\toutput to KDE system notifications.\n\n\
Mail bug reports and suggestions to <dap.darkness at gmail dot com>."

else
  IN="`curl -s 'http://stat.vessobel.by/cgi-bin/BILinfon.cgi?Login='$1 | iconv -f cp1251 -t utf-8`"

  if [ "`echo "$IN" | grep -o "$ERR"`" == "$ERR" ]
  then
    OUT='Wrong login!'

  else
    TOTAL=`echo "$IN" | grep ГБ`
    MINPRICE=`echo "$TOTAL" | awk '{ print $2 }' | grep -o '[0-9]*'`
    TOTAL=`echo "$TOTAL" | awk '{ print $1 }'`
    let 'TOTAL=TOTAL*1024'
    USED=`echo "$IN" | grep мб | awk '{ print $6 }' | grep -o '[0-9]*'`
    let 'FREE=TOTAL-USED'
    PRICE=`echo "$IN" | grep Отработано | grep -o '[0-9]*' | tr -d "\n"`

    if [ "$MINPRICE" -gt "$PRICE" ]
    then
      PRICE=$MINPRICE
    fi

    OUT=$USED' MB / '$FREE' MB | '$PRICE' BYR'
  fi
fi

if [ "`echo $@ | grep -o -- $KDEARG`" == $KDEARG ]
then
  kdialog --title "Vesso-Bel"  --passivepopup "$OUT"

else
  echo -e "$OUT"
fi