Download and show image in terminal (iterm2 only)

iccat.sh

#!/bin/bash

function print_image() {
  printf "\033]"
  printf "1337;File="
  echo -n "$1" | base64 -D | wc -c | awk '{printf "size=%d",$1}'
  printf ";inline=1:"
  echo -n "$1"
  printf "\a\n"
}

re='(https?)://[-A-Za-z0-9\+&@#/%?=~_|!:,.;]*[-A-Za-z0-9\+&@#/%=~_|]\.(png|jpg|gif|jpeg)'
if [[ $1 =~ $re ]]
  then
    print_image "$(curl -vs "$1" 2>/dev/null | base64)"
    exit 0
  else
    exit 1
fi

I'm sorry, I'm trying to figure out where i'd put this and how i'd run this.