#!/bin/bash

Help(){
	echo "Hello!"
	echo "This script finds all the subfolders of the first level, which is not open any file."

	exit
}
Solution(){

find "$dir" -mindepth 1 -maxdepth 1 -type d '!' -exec sh -c "lsof +d {} | grep -q ''" \; -print
}
dir=$1

if [ -z $1 ]; then dir=$(pwd); fi
if [[ $1 = "--help" || $1 = "-h" ]]; then Help; fi
if [[ -d "$dir" ]]; then Solution; fi