Primes a WordPress website cache by crawling each resource linked in sitemap.xml.

prime_wordpress_website_cache.sh

#!/usr/bin/env bash

set -o errexit
set -o nounset
set -o pipefail
if [[ "${TRACE-0}" == "1" ]]; then
  set -o xtrace
fi

usage() {
  echo '
  Usage: ./prime_wordpress_website_cache.sh HOSTNAME

  Primes a WordPress website cache by crawling each resource linked in sitemap.xml.
  '
}

if [[ "${1-}" =~ ^-*h(elp)?$ ]]; then
  usage
  exit
fi

if [ -z "${1-}" ]; then
  echo '
  HOSTNAME not specified
  '
  usage
  exit 1
fi

#cd "$(dirname "$0")"

main() {
  wget --quiet "https://${1}/sitemap.xml" --output-document - |
    grep -Eo "https?://${1}/[^<]+" |
    wget --quiet -i - --output-document - |
    grep -Eo "https?://${1}/[^<]+" |
    wget -i - --output-document /dev/null
}

main "$@"