chksum-all-recursive.sh

#!/usr/bin/env bash

set -euo pipefail
set -x

F_MD5=$(mktemp)
find -type f -exec md5sum "{}" + > "$F_MD5" &

F_SHA1=$(mktemp)
find -type f -exec sha1sum "{}" + > "$F_SHA1" &

F_SHA224=$(mktemp)
find -type f -exec sha224sum "{}" + > "$F_SHA224" &

F_SHA256=$(mktemp)
find -type f -exec sha256sum "{}" + > "$F_SHA256" &

F_SHA384=$(mktemp)
find -type f -exec sha384sum "{}" + > "$F_SHA384" &

F_SHA512=$(mktemp)
find -type f -exec sha512sum "{}" + > "$F_SHA512" &

wait

grep -v CHECKSUM "$F_MD5" > CHECKSUM.MD5
grep -v CHECKSUM "$F_SHA1" > CHECKSUM.SHA1
grep -v CHECKSUM "$F_SHA224" > CHECKSUM.SHA224
grep -v CHECKSUM "$F_SHA256" > CHECKSUM.SHA256
grep -v CHECKSUM "$F_SHA384" > CHECKSUM.SHA384
grep -v CHECKSUM "$F_SHA512" > CHECKSUM.SHA512
rm -f "$F_MD5" "$F_SHA1" "$F_SHA224" "$F_SHA256" "$F_SHA384" "$F_SHA512"

exit 0