Find simmilar compound to KEGGID

#!/bin/bash
#
# compare KEGGID with entire ZINC database
# ZINC database is extracted to ~/ZINC and decompressed
# with gunzip *.sdf.gz
# VR


#some checks

command -v wget >/dev/null 2>&1 || { echo >&2 "I require wget (gnu.org/software/wget) but it's not installed.  Aborting."; exit 1; }
command -v babel >/dev/null 2>&1 || { echo >&2 "I require openbabel (http://openbabel.org) but it's not installed.  Aborting."; exit 1; }

if [ ! -d ~/ZINC ]; then
  echo "Directory ~/ZINC with local ZINC database do not exist. Make it first."
  exit 1
fi

if [ $# -ne 1 ]; then
       echo "Usage ./search_ZINC.sh KEGGID"
       echo "KEGGID is C number from KEGG compound database:"
       echo "http://www.genome.jp/kegg/compound/"
       exit 1
fi

KEGGID=$1
echo "Downloading $KEGGID mol file from KEGG..."
wget http://www.genome.jp/dbget-bin/www_bget?-f+m+compound+${KEGGID} -O ${KEGGID}.mol
if [ ! -s ${KEGGID}.mol ]; then
     "File ${KEGGID}.mol is empty. Likely wrong KEGGID"
     exit 1
fi

for file in ~/ZINC/*.sdf
do
  echo "Comparing with ZINC package: $file"
  #Slow part:
  babel ${KEGGID}.mol $file -ofpt -xfFP2 > ${KEGGID}_${file}.log
  #print cases when Tanimoto score is 1
  grep 1$ ${KEGGID}_${file}.log
  #print cases when Tanimoto score is larger than 0.9 and lower than 1
  grep 0\.9.$ ${KEGGID}_${file}.log
done