#!/usr/bin/env bash

set -e

files=("$@")

if [ ${#files[@]} -eq 0 ]; then
	read -rp "Enter file(s) to sort: " -a files
fi

if [ ${#files[@]} -eq 0 ]; then
	echo "No files provided."
	exit 1
fi

for file in "${files[@]}"; do
	if [ ! -f "$file" ]; then
		echo "Error: '$file' is not a file."
		exit 1
	fi

	sort "$file" -o "$file"
done