Repeatedly calls URL and waits WAIT seconds

ping-url.sh

#! /bin/bash

URL=$1
WAIT=${2:-60}

if [[ $URL != http* ]] ;
then
  echo 'Repeatedly calls URL and waits WAIT seconds (default = 60)'
  echo 'usage example:'
  echo '$ ./ping-url.sh https://google.com 2'
  exit
fi


until false
do
  printf $(date -ju +"%Y-%m-%dT%H:%M:%SZ")
  curl --silent --show-error --output /dev/null --write-out " (%{http_code}) %{url_effective}\n" $URL
  sleep $WAIT
done