#!/usr/bin/env bash
set -euo pipefail
if (( $# < 2 )); then
	echo "USAGE: $0 DIGITS FILES"
	return 1
fi
digits="$1"
shift 1
i=1
for file in "$@"; do
	file="$(readlink -f "$file")"
	mv -n "$file" "${file%/*}/$(printf "%0${digits}d" "$i").${file##*.}"
	i="$((i+1))"
done