Subresource integrity bash scriptlet

get-sri.sh

#!/usr/bin/env bash
# Adapted from https://developer.mozilla.org/en-US/docs/Web/Security/Subresource_Integrity
# example code within which appears to be CC0 public domain. Likewise for this work:
# CC0: This work has been marked as dedicated to the public domain.
url=${1:-https://code.jquery.com/jquery-3.6.0.slim.min.js}
algo=${2:-sha384}
hash=$(curl -s "$url" |  openssl dgst -"$algo" -binary | openssl base64 -A)
if grep -q css <<<"$url" >/dev/null 2>&1; then
  out='<link rel="stylesheet" href="%s" integrity="%s-%s" crossorigin="anonymous">\n'
else
  out='<script src="%s" integrity="%s-%s" crossorigin="anonymous">\n'
fi
printf "$out" "$url" "$algo" "$hash"