#!/bin/bash

if [ "$#" -ne 1 ]
  then
     echo You must input path as first argument. Print '?' for more information.
  else
     if [ "$1" == '?' ]
       then
	   echo Recursive output unique extensions and their count. You must input path as first argument; example var27 /home/dir .
       else
	   find $1 -type f | grep -o '\.[^.]\+$' | sort | uniq -c
     fi

fi