Generate md5sum on all files and subdirs

checksum_demo.sh

#!/usr/bin/bash

# Setup our files
mkdir hashtest
echo hello > hashtest/file1.txt
echo foo > hashtest/file2.txt
echo bar > hashtest/file3.txt
mkdir hashtest/subdir
echo baz > hashtest/subdir/file4.txt
echo hello > hashtest/subdir/file5.txt

# Generate hashes for all files
find ./hashtest/ -type f -exec md5sum {} \;

# Save hashes to a file
find ./hashtest/ -type f -exec md5sum {} + > checklist.md5

# Verify the hashes from the file
md5sum -c checklist.md5