Getting Dynamic IP from pi in mail

ip.sh

#!/bin/bash
NOWIPADDR="/home/pi/nowipaddr"
GETIPADDR="dig +short myip.opendns.com @resolver1.opendns.com"
LOG="/home/pi/ip.log"
timestamp=$( date +%T )
curDate=$( date +"%m-%d-%y" )

if [ -f $NOWIPADDR ]; then
  if [[ `$GETIPADDR` = $(< $NOWIPADDR) ]]; then
    echo $curDate $timestamp " IP address check: " $(< $NOWIPADDR) >> $LOG
  else
    $GETIPADDR > $NOWIPADDR
    mail -s "ADD SUBJECT HERE" ABCXYZ@gmail.com < $NOWIPADDR
fi
else
  curl $GETIPADDR > $NOWIPADDR
  mail -s "ADD SUBJECT HERE" ABCXYZ@gmail.com < $NOWIPADDR
fi