[文本处理] [已解决]批处理如何删除该逗号？

@echo off
setlocal enabledelayedexpansion&cls
::==============================================================
:start
for /f "tokens=1,2,3* usebackq delims=" %%a in ("a.txt") do (
set "fline=%%a"
set "fline=!fline:"=☆!"
for /f "tokens=1,2,3* delims=☆" %%i in ("!fline!") do (
set "a1=%%j"
set "a1=!a1:,=!"
echo %%i"!a1!"%%k>>youfile.txt
)
)
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sed "s/\(\"[0-9]\+\),\([0-9]\+\"\)/\1\2/g" 1.txt >2.txt
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@echo off
setlocal enabledelayedexpansion&cls
::==============================================================
:start
for /f "tokens=1* usebackq delims=" %%A in ("a.txt") do (
set "aa=%%A"
set "aa=!aa:”="!"
)
for /f "tokens=1-25" %%a in ("%aa%") do echo %%a%%b%%c%%d%%e%%f%%g%%h%%i%%j
for /f "tokens=1-25" %%a in ("!aa!") do echo %%a%%b%%c%%d%%e%%f%%g%%h%%i%%j
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@echo off&setlocal enabledelayedexpansion
for /f "usebackq delims=" %%a in ("a.txt") do (
    for %%b in (%%a) do (
        for /f "tokens=1* delims=," %%c in ("%%b") do (
            if "%%d" neq "" (
               set str=%%c%%d
               set var=!var!,!str:,=!
            )else set var=!var!,%%c
        )
    )
    echo!var!&set "var="
)                   
pause
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(for /f "usebackq ........
......
... echo!var!&set "var="
))>new.txt
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@echo off&setlocal enabledelayedexpansion
for /f "delims=" %%a in (a.txt) do (
    for %%i in (%%a) do  set "v=%%i"&set "s=!s!!v:,=!,"
    echo !s:~,-1!&set s=
)
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