compare_folders.sh

#!/bin/bash

# Example file structure:
# .
# ├── jpg
# │   ├── 123.jpg
# │   ├── 789.jpg
# │   └── 890.jpg
# └── raw
#     ├── 123.raw
#     ├── 456.raw
#     └── 789.raw
# 
# ❯ ./compare_folders.sh raw jpg
# Only in raw:
# raw/456.raw
# 
# Only in jpg:
# jpg/890.jpg
# 
# ========================================
# WARNING: Deletion is PERMANENT and
# UNRECOVERABLE! Files will NOT go to Trash.
# ========================================
# 
# Would you like to delete the unmatched files?
#   1) Delete files in raw that are missing in jpg
#   2) Delete files in jpg that are missing in raw
#   3) Do nothing and exit
# 
# Choose [1/2/3]:
# 
if [ $# -lt 2 ]; then
  echo "Usage: $0 <folder1> <folder2>"
  exit 1
fi

dir1="$1"
dir2="$2"

# Extract basenames without extensions
names1=$(ls "$dir1" | sed 's/\.[^.]*$//' | sort)
names2=$(ls "$dir2" | sed 's/\.[^.]*$//' | sort)

only_in_1=$(comm -23 <(echo "$names1") <(echo "$names2"))
only_in_2=$(comm -13 <(echo "$names1") <(echo "$names2"))

if [ -n "$only_in_1" ]; then
  echo "Only in $dir1:"
  for name in $only_in_1; do
    ls "$dir1"/"$name".* 2>/dev/null
  done
  echo ""
fi

if [ -n "$only_in_2" ]; then
  echo "Only in $dir2:"
  for name in $only_in_2; do
    ls "$dir2"/"$name".* 2>/dev/null
  done
  echo ""
fi

if [ -z "$only_in_1" ] && [ -z "$only_in_2" ]; then
  echo "All file basenames match between the two folders."
  exit 0
fi

# Offer to delete
echo "========================================"
echo "WARNING: Deletion is PERMANENT and"
echo "UNRECOVERABLE! Files will NOT go to Trash."
echo "========================================"
echo ""
echo "Would you like to delete the unmatched files?"
echo "  1) Delete files in $dir1 that are missing in $dir2"
echo "  2) Delete files in $dir2 that are missing in $dir1"
echo "  3) Do nothing and exit"
echo ""
read -rp "Choose [1/2/3]: " choice

case "$choice" in
  1)
    if [ -z "$only_in_1" ]; then
      echo "No unmatched files in $dir1. Nothing to delete."
      exit 0
    fi
    echo ""
    echo "The following files will be PERMANENTLY deleted:"
    for name in $only_in_1; do
      ls "$dir1"/"$name".* 2>/dev/null
    done
    echo ""
    read -rp "Are you sure? Type YES to confirm: " confirm
    if [ "$confirm" = "YES" ]; then
      for name in $only_in_1; do
        rm -v "$dir1"/"$name".* 2>/dev/null
      done
      echo "Done."
    else
      echo "Aborted."
    fi
    ;;
  2)
    if [ -z "$only_in_2" ]; then
      echo "No unmatched files in $dir2. Nothing to delete."
      exit 0
    fi
    echo ""
    echo "The following files will be PERMANENTLY deleted:"
    for name in $only_in_2; do
      ls "$dir2"/"$name".* 2>/dev/null
    done
    echo ""
    read -rp "Are you sure? Type YES to confirm: " confirm
    if [ "$confirm" = "YES" ]; then
      for name in $only_in_2; do
        rm -v "$dir2"/"$name".* 2>/dev/null
      done
      echo "Done."
    else
      echo "Aborted."
    fi
    ;;
  *)
    echo "No files deleted."
    ;;
esac