Rename Images to MD5

#!/bin/sh
# Renames images to their md5sum or md5sum-copy-#.
# Usage:    sh image-renamer <directory>
#   Example:  sh image-renamer .
#   Example:  sh image-renamer "main directory"/sub\ directory/subdir

# -maxdepth 1:   Don't search deeper into directories
# -type f:       Only find regular files (not directories, links, etc.)
# -iname "...":  Case insensitive search on filename
find "$1" -maxdepth 1 -type f -iname "*[.png|.jpg|.jpeg|.gif|.bmp]" -print | while read FILE
do
  DIR=`dirname "$FILE"`                            # File directory
  EXT=`echo "$FILE" | rev | cut -d '.' -f 1 | rev` # File extension/type
  NAME=`basename "$FILE" ".$EXT"`                  # File name, not used
  # echo "["$DIR"] ["$NAME"] ["$EXT"]"

  MD5=`md5sum "$FILE" | cut -d ' ' -f 1`
  # echo "["$MD5"]"

  NEW_FILE=""$DIR"/"$MD5"."$EXT""

  # If NEW_FILE exists...
  if [ -f "$NEW_FILE" ]; then
    for i in $(seq 1 50); do
      NEW_FILE=""$DIR"/"$MD5"-copy-$i."$EXT""
      # If NEW_FILE does not exist...
      if [ ! -f "$NEW_FILE" ]; then
        # Figured out a valid file name; exit loop
        break
      fi
    done
  fi

  # echo "["$NEW_FILE"]"

  # Use move command to rename so can do "-n"
  #   -n:  Do not overwrite an existing file
  #   -v:  Verbose; explain everything being done
  mv -n -v "$FILE" "$NEW_FILE"
done