Script for recursive checksum over directory content

recursive_file_checksum.sh

#!/usr/bin/env bash

# NOTES:
#   perfoms md5sum on all files in the directory, sorts them and creates an overall md5sum
#   WARNING: the sort order & checksum will change if you do not use the same LANG/LC_ALL!

EXCLUDES=('dir1' 'dir2/*')

set -eo pipefail

if [[ -z "$1" ]]
then
  echo "USAGE:"
  echo " 1 > Path to base directory"
  exit 1
fi

set -u

export LANG='en_US.UTF-8'
export LC_ALL='en_US.UTF-8'

CHECK_DIR="$1"

cd "$CHECK_DIR"
exclude_args=''

for exc in "${EXCLUDES[@]}"
do
  # shellcheck disable=SC2089
  exclude_args="${exclude_args} -not -path \"./${exc}\""
done

# shellcheck disable=SC2090,SC2086
find . -type f $exclude_args -print0 | sort -z | xargs -0 md5sum  | sort | md5sum | cut -d ' ' -f1