gawk -vN=4 "NR>FNR;NR==FNR{if(NR>N){print a[NR%N]}{a[NR%N]=$0;NN=NR}}END{for(i=NN-N;++i<=NN;)if(i%N in a)print a[i%N]}" 1.txt 2.txt>3.txt
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gawk -vN=4 "NR>FNR;NR==FNR{if(NR>N){print a[NR%%N]}{a[NR%%N]=$0;NN=NR}}END{for(i=NN-N;++i<=NN;)if(i%%N in a)print a[i%%N]}" 1.txt 2.txt>3.txt
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@echo off
chcp 65001 >nul
gawk -vN=4 "NR>FNR;NR==FNR{if(NR>N){print a[NR%%N]}{a[NR%%N]=$0;NN=NR}}END{for(i=NN-N;++i<=NN;)if(i%%N in a)print a[i%%N]}" 1.txt 2.txt>3.txt
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@echo off
chcp 65001 >nul
set /p x=Please enter the specified line number:
set /a m=x-1
(for /f "delims=" %%i in (1.txt) do (
    if defined Line4 echo,!Line4!
    for /l %%j in (%m%,-1,1) do (
        set /a n=%%j+1
        set Line!n!=!Line%%j!
    )
    set line1=%%i
)
if defined Line4 (
    type 2.txt
    for /l %%i in (%x%,-1,1) do echo,!Line%%i!
))>3.txt
pause
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@echo off
for /f %%n in ('sed -n "$=" 1.txt') do set/a "n=%%n-4"
sed "%n% r 2.txt" 1.txt>1.new.txt
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@echo off &setlocal enabledelayedexpansion
chcp 65001>nul
set "n=1" & for /f %%n in ('find /v /c "" ^<1.txt') do set/a "m=%%n-4"
(for /f "delims=" %%s in (1.txt) do if !n! leq !m! (set/a "n+=1" & echo,%%s))>1.1
more +!m! 1.txt>1.2
copy /y 1.1+2.txt+1.2 1.new.txt>nul
del /q 1.1 1.2 & chcp 936>nul & endlocal&exit/b
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@echo off
for /f %%n in ('sed -n "$=" 1.txt') do set/a "n=%%n-4"
echo,>>2.txt & sed "%n% r 2.txt" 1.txt>1.new.txt
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sed "4r2.txt" 1.txt>3.txt
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sed -e "4r2.txt" -e "5s/^/\n/" 1.txt>3.txt
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(findstr /v $ 2.txt>nul && (sed -e "5 s/^/\n/" -e "4 r 2.txt" 1.txt)||sed "4 r 2.txt" 1.txt)>1.new.txt
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@echo off
for /f %%n in ('sed -n "$=" 1.txt') do (set/a "n=%%n-4, m=n+1")
(findstr /v $ 2.txt>nul && (sed -e "%m% s/^/\n/" -e "%n% r 2.txt" 1.txt)||sed "%n% r 2.txt" 1.txt)>1.new.txt
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@echo off
chcp 65001>nul
set x=4
set /a m=x-1
setlocal enabledelayedexpansion
(for /f "delims=" %%i in (1.txt) do (
    if defined Line4 echo,!Line4!
    for /l %%j in (%m%,-1,1) do (
        set /a n=%%j+1
        set Line!n!=!Line%%j!
    )
    set line1=%%i
)
if defined Line4 (
    for /f "delims=" %%i in (2.txt) do echo,%%i
    for /l %%i in (%x%,-1,1) do echo,!Line%%i!
))>3.txt
pause
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sed -n -e ":a;$r 2.txt" -e "$q;N;5,${P;D};ba" 1.txt|sed "${/^$/!s/$/\n/}">1_new.txt
sed ":a;$q;N;5,$D;ba" 1.txt>>1_new.txt
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@echo off
chcp 65001 > nul
for /f "delims=" %%i in (1.txt) do set /a n+=1
(for /f "delims=" %%i in (1.txt) do (
    set /a n-=1
    echo;%%i
    setlocal enabledelayedexpansion
    if !n!==4 (
        endlocal
        for /f "delims=" %%j in (2.txt) do echo;%%j
    ) else endlocal
)) > 3.txt
pause
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gawk "NR==FNR{a[NR]=$0}NR>FNR{b[FNR]=$0}END{n=length(a)-4;for(i in a){print a[i];if(i==n)for(j in b)print b[j]}}" 1.txt 2.txt>3.txt
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@echo off
set n=4
PowerShell "[Collections.ArrayList]$a=gc 1.txt -enc UTF8; $b=gc 2.txt -enc UTF8; $a.Insert($a.Count-%n%, $b); sc 3.txt $a -enc UTF8"
pause
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