Tool to get traffic statistic from Internet provider Vesso-Bel (BY) using curl [v.0.2.1.3]

vessobel.sh

#!/bin/zsh

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

if [ -n "`echo $@ | grep -o -- $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 -s -f cp1251 -t utf-8`"

  if [ -n "`echo "$IN" | grep -o "$IPERR"`" ]
  then
    OUT='Wrong IP address!'

  else
    if [ -n "`echo "$IN" | grep -o "$LOGERR"`" ]
    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
fi

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

else
  echo -e "$OUT"
fi