cd installers

# SHA256 + SHA512 sidecar files
shasum -a 256 * > checksums.sha256
shasum -a 512 * > checksums.sha512

# Combined checksums.txt in "ALG (file) = hash" format
{
  for f in *; do
    [ -f "$f" ] || continue
    sha256=$(shasum -a 256 "$f" | awk '{print $1}')
    sha512=$(shasum -a 512 "$f" | awk '{print $1}')
    printf "SHA256 (%s) = %s\n" "$f" "$sha256"
    printf "SHA512 (%s) = %s\n" "$f" "$sha512"
  done
} > checksums.txt