переименование картинок под формат фотоаппарата Riclend

rename.sh

script_name="${0##*/}"

file_extension="jpg"
file_list=$(find "./" -type f -name "*.jpg")

current_number=0

for file_name in $file_list; do
  file_number=""

  if [[ $current_number -lt 10 ]]; then
    file_number="000${current_number}"
  elif [[ $current_number -lt 100 ]]; then
    file_number="00${current_number}"
  elif [[ $current_number -lt 1000 ]]; then
    file_number="0${current_number}"
  else
    file_number=$i
  fi

  final_file_name="PICT${file_number}.${file_extension}"

  mv $file_name $final_file_name

  ((current_number++))
done