Bash helper script for recursively lowercasing file names

downcase.sh

#!/bin/bash
#
# downcase PATH
#
# Recursively convert all file names contained in the given directory     
# tree (but excluding the given directory itself) to lowercase.
# Existing files which are named identical to new, lowercased file
# names will be clobbered.
#
# Author: Ross Paffett <ross@rosspaffett.com>
# Inspiration: http://stackoverflow.com/a/152836

if [ -n "$1" ]; then
        find "$1" -depth -mindepth 1 \( -type d -or -type f \) -print0 | xargs -0n 1 bash -c \
                'src=$(dirname "$0")/$(basename "$0");
                 dst=$(dirname "$0")/$(basename "$0" | tr "[A-Z]" "[a-z]");
                 mv -fv "$src" "$dst"'
else
        echo "usage: downcase PATH"
        exit 1
fi