CheckIPAddress(){    echo $1 |grep "^[0-9]/{1,3/}/.[0-9]/{1,3/}/.[0-9]/{1,3/}/.[0-9]/{1,3/}$" > /dev/null    if [ $? = 1 ];  then        return 1    else        a=`echo $1 | awk -F. '{print $1}'`        b=`echo $1 | awk -F. '{print $2}'`        c=`echo $1 | awk -F. '{print $3}'`        d=`echo $1 | awk -F. '{print $4}'`        #echo $a $b $c $d        for loop in $a $b $c $d        do            if [ $loop -ge 255 ] || [ $loop -lt 0 ]; then                return 2            fi        done    fi  }ConfigureDefaultRegion() {  echo "Please input Region ip"  ret=1  while [ $ret != 0 ]  do   read region_ip   CheckIPAddress $region_ip   ret=$?   #echo $ret   if [ $ret = 1 ]; then    echo "Wrong IP address, please reinput Region IP:"   fi  done  /usr/bin/mysql -u root realworx_production -e "update regions set ip='$region_ip' where id=1" 1>/dev/null 2>/dev/null  if [ $? = 0 ]; then          /usr/bin/mysql -u root realworx_production -e "update config_params set val=1 where ident=55" 1>/dev/null 2>/dev/null          echo "set '$region_ip' as Default and Admin Region IP"  else          val=`/usr/bin/mysql -u root realworx_production -e "select id from regions where ip='$region_ip'" | awk '{if ($1 != "id") print $1}'`          /usr/bin/mysql -u root realworx_production -e "update config_params set val='$val' where ident=55" 1>/dev/null 2>/dev/null          region_name=`/usr/bin/mysql -u root realworx_production -e "select name from regions where ip='$region_ip'" | awk '{if ($1 != "name") print $1}'`          echo "IP already exists. So set '$region_name' as Admin Region. "  fi  echo "Region Setting Successfull."}