Find out if two directories contain the same files or where they differ; see https://www.how-hard-can-it.be/basic-directories-diff/ for details

basic_directories_diff.sh

#!/bin/bash

# Input parameter validation
if [ "$#" -lt 2 ]; then
    script_name=$(basename "$0")
    echo "Usage:   ${script_name} <directory-one> <directory-two>"
    echo "Example: ${script_name} one/ two/"
    exit -1
fi

# Input parameter assignment
directory_one=$1
directory_two=$2

# Get the contents of the two directories
contents_directory_one=$(cd "${directory_one}" && find . | sort)
contents_directory_two=$(cd "${directory_two}" && find . | sort)

# Diff the contents of the two directories
difference=$(diff -u <(echo "${contents_directory_one}") <(echo "${contents_directory_two}"))

# Provide some visual feedback to the user
if [ -z "${difference}"]
then
  echo "Both directories are identical."
else
  echo "The directories differ!"
  echo "${difference}"
fi