Take response times of a site at given interval

curl-times.sh

#!/bin/bash
# Adopted from https://josephscott.org/archives/2011/10/timing-details-with-curl/
# 
url=${1:?usage "[nohup] curl-times.sh <url> [ <sleep=1> ]"}
sleep=${2:-1}

format=" time_namelookup: %{time_namelookup} time_connect: %{time_connect}, time_appconnect: %{time_appconnect}, time_pretransfer: %{time_pretransfer}, time_redirect: %{time_redirect}, time_starttransfer: %{time_starttransfer}, time_total: %{time_total}\n"
while true; do
  echo -n $(date +%FT%T%z)
  curl -w "${format}" -o /dev/null -s "$url"
  sleep $sleep
done