计算行数

@echo off
set DstDir=C:\testlog
set MaxFlag=3

type nul>%DstDir%\result.log
for /f "tokens=1*" %%a in ('dir %DstDir%\diff*.log /b') do (
call :count %%a
)
goto :eof

:count
for /f "delims=:" %%h in ('findstr /n .* "%DstDir%\%1"') do (
set line=%%h
  set fname=%1
)
if %line% gtr %MaxFlag% (
echo %fname%>>%DstDir%\result.log
)