path-tr

#!/usr/bin/env bash
#
# Author: James Cherti
# URL: https://github.com/jamescherti/bash-stdops
#
# Description:
# ------------
# This script modifies the file name of the path using the 'tr' command.
#
# It processes a given file path, extracts the directory and filename, converts
# the filename using the specified `tr` options (e.g., to lowercase), and prints
# the modified full path.
#
# Example usage:
#   path-tr /Path/TO/FILE '[:upper:]' '[:lower:]'
#   This will convert the filename to lowercase, producing: /Path/TO/file
#
# License:
# --------
# Copyright (C) 2012-2025 James Cherti
#
# Distributed under terms of the GNU General Public License version 3.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <https://www.gnu.org/licenses/>.
#

set -euf -o pipefail

if [[ $# -lt 1 ]]; then
  echo "Modify the file name using the 'tr' command."
  echo
  echo "Usage: $0 <path-to-file> <tr-args>"
  exit 1
fi

FILE_PATH=$(readlink -m "$1")
shift

DIR=$(dirname "$FILE_PATH")
FILENAME=$(basename "$FILE_PATH")
LC_FILENAME=$(printf "%s\n" "$FILENAME" | tr "$@")

printf "%s/%s\n" "$DIR" "$LC_FILENAME"