create ipset from isp cidr txt

create_ipset.sh

ipset destroy; 
for isp in ./*.txt; > ipset.sh
do 
  isp_name=`basename $isp .txt`; 
  echo "#$isp_name"; 
  echo "ipset create $isp_name hash:net"; 
  for cidr in `cat $isp`; 
  do 
    echo "ipset add $isp_name $cidr"; 
  done; 
done