bash script

#!/bin/bash
RR=www.com
[ #$ -le 1 ]&&{ echo "usage: ${0} -h <ip>"; exit 126; }
while getopts "h:" OPT;do
              case $OPT in
                           h)host=$OPTARG;;
                           *)echo "usage: ${0} -h <ip>"&&exit 1;;
              esac
done
rndc flushname ${RR}
dig @${host} soa ${RR}|grep "\<${RR}\>" >/dev/null
exit $?