A bulk file renaming script using bash, which renames files from a text file containing names

renamer.sh

#!/bin/bash

directory="/path/to/your/directory"
names_file="/path/to/your/names.txt"

# Read new names into an array
new_names=()
while IFS= read -r line; do
    new_names+=("$line")
done < "$names_file"

# Get a list of non-hidden files in the directory, sorted by name
files=($(ls -v "$directory" | grep -vE "^\."))

# Check if the number of files matches the number of new names
if [ "${#files[@]}" != "${#new_names[@]}" ]; then
    echo "Number of files and names don't match."
    exit 1
fi

# Determine number of digits for padding
num_files=${#files[@]}
num_digits=$(echo "${num_files}" | wc -m)

# Ask if user wants to add numbers and keep extensions
read -p "Add numbers to file names? (y/n): " add_numbers
read -p "Keep original file extensions? (y/n): " keep_extensions

# Rename files preserving extensions and optionally adding numbers
for ((i=0; i<${#files[@]}; i++)); do
    old_file="$directory/${files[$i]}"
    base_name="${new_names[$i]}"
    ext="${files[$i]##*.}"  # Extract extension
    if [[ "$add_numbers" == "y" ]]; then
      new_name=$(printf "%0${num_digits}d" $((i+1)))"-${base_name}"
    else
      new_name="$base_name"
    fi
    if [[ "$keep_extensions" == "y" ]]; then
      new_name+="$ext"
    fi
    new_file="$directory/$new_name"
    mv -i "$old_file" "$new_file"
done