@echo off
for /f %%a in ('^(type a.txt^&echo.^)^|find /c /v ""') do (
    for /f %%b in ('find /c /v "" ^< a.txt') do (
        if "%%a"=="%%b" (echo 不是空行) else echo 空行
    )
)
pause
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((type a.txt&echo.)|find /c /v "" & find /c /v ""<a.txt)>.temp
set /p line=<.temp
for /f "skip=1" %%a in (.temp) do (
    if "%%a"=="%line%" (echo 不是空行) else echo 空行
)
del .temp
pause
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@echo off
for /f %%a in ('find/c /v "" ^< a.txt') do (
   for /f %%b in ('"(type a.txt&set/p= <nul)|find/c /v """') do (
   if "%%a" neq "%%b" (echo 最后行是空行)else echo 最后行不是空行
))
pause
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@echo off
more a.txt>b.txt
fc /l a.txt b.txt >nul && echo 是空行。
for %%a in (a.txt) do for %%i in (b.txt) do if %%~za==%%~zi echo 是空行
rem 可能for速度快点。
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@echo off
findstr /n .* y1.txt>b1.txt
(type y1.txt&set/p= <nul)>b2.txt
findstr /n .* b2.txt>b3.txt
for %%a in (b3.txt) do for %%b in (b1.txt) do set /a n=%%~za-%%~zb
if %n% gtr 1 (echo 空行)else echo 不是空行
del b1.txt b2.txt b3.txt
pause
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@echo off
copy /b a.txt a.tmp>nul
echo a>>a.tmp
for /f %%a in ('find /c /v "" ^<a.txt') do ^
for /f %%b in ('find /c /v "" ^<a.tmp') do ^
if %%a==%%b (echo 非空行) else echo 空行
del a.tmp
pause
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@echo off
sort a.txt>b.txt
for %%a in (a.txt) do for %%b in (b.txt) do if %%~za equ %%~zb (echo 空行)else echo 不是空行
pause
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@echo off
findstr /v $ test.txt>nul || echo 空行
pause
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findstr /n /v $ test.txt
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