[文本处理] 【已解决】BAT：合并与拆分文本，如何以空行为分割？

awk -v"RS=" "{print $0,ORS}" 1.txt 2.txt 3.txt>4.txt
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awk -v"RS=" "{print $0>NR\".txt\"}" 4.txt
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@echo off
(for /l %%l in (1,1,3) do (
        for /f "useback delims=" %%a in ("%%l.txt") do (
                echo %%a
        )
        echo=
))>123.txt
pause
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@echo off
setlocal enabledelayedexpansion
set n=1
for /f "tokens=1* delims=:" %%a in ('findstr /n .* "123.txt"') do (
        if "%%b" equ "" (
                if exist "!n!.txt" (
                        set /a n+=1
                )
        ) else (
                >>"!n!.txt" echo %%b
        )
)
endlocal
pause
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@echo off
find /v "" *.txt|findstr /irvc:"^-.*\.TXT$"|more /s|more +1>123.txt
pause
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@echo off
type *.txt 2>&1|findstr /ivec:".txt"|more /s|more +1>123.txt
pause
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@echo off
for %%a in (.) do (
	type *.txt 2>&1|findstr /ivec:".txt"|more /s|more +1>"%%~nxa.txt"
)
pause
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ffmpeg -i 123.mp4 -an -vf select='eq(pict_type\,I)' -vsync 2  -f image2 image-%03d.png
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