@echo off
set folder_path=..\source
dir /b %folder_path% > tmp.txt
for /F "usebackq" %%i in (tmp.txt) do cat %folder_path%/%%i | find /c /v "" >> num.txt
set n=0
for /F "usebackq" %%i in (num.txt) do set /a n=n+%%i
echo 合計数: %n%
PAUSE
del tmp.txt
del num.txt