Tool to get traffic statistic from Internet provider Vesso-Bel (BY) using curl [v.0.2.0]

vessobel.sh

#!/bin/bash

HLPARG=--help
TMPDIR=/tmp/vessobel
ERR='" либо eMail="" не найден'
HTM=vessobel.html
HLPMSG="Tool to get traffic statistic from Internet provider Vesso-Bel (Belarus).\n\n\
Usage: vessobel.sh [LOGIN]\n\nOutput: [Used in MB] / [Free in MB] | [Total in GB]\n\n\
Options:\n\t--help\t\tprint this help.\n\n\
Mail bug reports and suggestions to <dap.darkness at gmail dot com>."

if [ "`echo $@ | grep -o -- $HLPARG`" == $HLPARG ]

then
  echo -e $HLPMSG
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
  
    TTLGB=`echo "$IN" | grep ГБ | awk '{ print $1 }'`
    let 'TTLMB=TTLGB*1024'
    USED=`echo "$IN" | grep мб | awk '{ print $6 }' | grep -o '[0-9]*'`
    let 'FREE=TTLMB-USED'

    OUT=$USED' / '$FREE' | '$TTLGB'GB'
  fi
  
  echo $OUT
fi