@echo off

　　:: 把多行文本拼接成用;连接的一行

　　:: <NUL 不能省略，省略掉就无法运行下去

　　for /f "tokens=*" %%i in (a.txt) do set /p "var=%%i;" >b.txt

　　exit
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@echo off
for /f  %%a in (a.txt) do set /p=%%a;<nul>>b.txt
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@echo off&setlocal enabledelayedexpansion
set /a num=1
for /f "delims=" %%a in (a.txt) do (
     set /a n+=1,m=n%%5
     set "str=!str!%%a;"
     if !m! equ 0 echo !str!>!num!.txt&set "str="&set /a num+=1
)
if defined str echo %str%>%num%.txt
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@echo off
setlocal enabledelayedexpansion
set "SrcFile=a.txt"
set "DstFile=b.txt"
set "MergeNum=5"
set "Delimiter=;"

type nul>"%DstFile%"
for /f "usebackq tokens=*" %%a in ("%SrcFile%") do (
    set /a RowTotal+=1
    set /a Count+=1
    set "RowMerge=!RowMerge!%Delimiter%%%a"
    if !Count! equ !MergeNum! (
        >>"%DstFile%" echo,!RowMerge:~1!
        set RowMerge=
        set Count=0
    )
)

set /a RowMod=RowTotal%%MergeNum
if !RowMod! equ 0 (
    goto :end
)
>>"%DstFile%" echo,!RowMerge:~1!
:end
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@echo off
(for /f  %%a in (a.txt) do (
    set /a n+=1,m=n%%5&set /p=%%a;<nul
    set /a test=1/m||echo;
))>b,txt
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@echo off&setlocal enabledelayedexpansion
for /f "delims=" %%i in (2.txt) do (set /a n+=1
 set a=!a!%%i
 if !n! equ 5 (echo !a!>>输出文件.txt&&set n=&set a=)
)
pause
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