[文本处理] 请教批处理如何替换文本末尾最后的几个字符？

@echo off
setlocal enabledelayedexpansion
for /f "tokens=1* delims=:" %%a in ('findstr /n .* 1.txt') do set num=%%a
for /f "tokens=1* delims=:" %%b in ('findstr /n .* 1.txt') do (
set str=%%c
set /a n+=1
if not "!n!"=="%num%" (
echo;!str!>>2.txt
) else (
echo;!str:~0,-2!ba>>2.txt )
)
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@echo off&setlocal enabledelayedexpansion
for /f "tokens=1* delims=:" %%a in ('findstr /n .* 1.txt') do set "ln=%%a" &set "last=%%b"
(for /f "tokens=1* delims=:" %%a in ('findstr /n .* 1.txt') do if %%a neq %ln% (echo;%%b) else (echo;!last:~0,-2!ba ))>>2.txt
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' 2>nul&cls&type a.txt|cscript -nologo -e:"vbs" "%~0"&pause&exit
read=wsh.stdin.readall
wsh.echo left(read,len(read)-2) & "ba"
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@echo off
for /f "delims=" %%1 in (a.txt)do (
set /a n+=1
call set #_%%n%%=%%1
)
call set #_%%n%%=%%#_%n%%:~,-2%%ba
for /l %%1 in (1 1 %n%)do call echo %%#_%%1%%
pause
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//&cls&cscript -nologo -e:jscript "%~f0"<"文本.txt"&pause&exit
WSH.Echo(WSH.StdIn.ReadAll().replace(/[^\r\n]([\r\n]*)[^\r\n][\r\n]*?$/, 'b$1a'))
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@echo off&setlocal enabledelayedexpansion
for /f "delims=" %%a in ('findstr .* a.txt^|find /v /c ""') do set /a ln=%%a,n=1
echo;%ln%&pause
for /f "tokens=1* delims=:" %%b in ('findstr /n .* a.txt') do set last=%%c
echo;%last%&pause
for /f "tokens=1* delims=:" %%d in ('findstr /n .* a.txt') do (
if %%d neq %ln% (
set line=%%e 
echo;!line!
set /a n+=1
) else (
echo;!last:~0,-2!ba
)
)>>2.txt
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@echo off
setlocal enabledelayedexpansion
for /f "delims=" %%i in (1.txt) do (
        if defined s echo;!s!
        set "s=%%i"
)
echo;!s:~0,-2!ss
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sed "$s/..$/ba/" 1.txt > 2.txt
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@echo off
setlocal enabledelayedexpansion
for /f "tokens=1* delims=:" %%a in ('findstr /n .* 1.txt') do (
    set "ln=%%a"
    set "last=%%b"
)
(for /f "tokens=1* delims=:" %%a in ('findstr /n .* 1.txt') do (
    if %%a neq %ln% (
        echo;%%b
    ) else (
        echo;!last:~0,-2!ba
    )
))>2.txt
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