terse

先发个

@echo off&setlocal enabledelayedexpansion

set "Tab=    "这里改为跳格键

for /f "delims=" %%i in (a.txt) do (

    set "str=%%i"

    set "str="!str:%Tab%="%Tab%"!""

    for %%j in (!str!) do (

        set "var=!str:*%%j=!"

        set "var1=!var:*%%j=!"

        if "!var!" neq "" if "!var!" neq "!var1!" set "Tem=!Tem! %%~j"

    )

    echo!Tem!&set Tem=

)

pause
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[]

terse

在列里找相同吗?

@echo off&setlocal enabledelayedexpansion
set "Tab=	"这里改为跳格键
for /f "delims=" %%i in (_a.txt) do (
    set "str=%%i"
    set n=
    for %%j in ("!str:%Tab%="%Tab%"!") do (
        set /a n+=1
        for %%k in (!n!) do set l_%%k=!l_%%k!%Tab%%%j
    )
)
for /l %%i in (1 1 %n%) do (
    for %%j in (!l_%%i!) do (
        set "var=!l_%%i:*%%j=!"
        if "!var!" neq "" if "!var!" neq "!var:*%%j=!" set "Tem=!Tem! %%~j"
    )
    if defined Tem echo %%i列:!Tem!&set Tem=
)
pause
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terse

原来这样  理解能力问题

@echo off&setlocal enabledelayedexpansion
set "Tab=        "这里改为跳格键
for /f "delims=" %%i in (_a.txt) do (
    set str=%%i&set n=
    for %%j in ("!str:%Tab%="%Tab%"!") do (
        set /a n+=1
        for %%k in (!n!) do set "l_%%k=!l_%%k!|%%~j"
    )
)
for /l %%i in (1 1 %n%) do (
    for %%j in ("!l_%%i:~1!") do (
        if defined _%%j (
           if defined -%%j (
              set "-%%j=!-%%j! %%i列"
           ) else set /a m+=1&set __!m!=%%j&set "-%%j=!_%%j! %%i列"
        ) else set _%%j=%%i列
    )
)
for /l %%i in (1 1 %m%) do for %%j in (!__%%i!) do echo 第!-%%j!内容相同,列内容如下：&echo %%~j
pause
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terse

就现思路效率很难提升了 或许有其他路径走
最多也就16楼的第二段上简化下 但效率差不多 也就不在上面改了

for /l %%i in (1 1 %n%) do ( 
    for %%j in ("!l_%%i:~1!") do (
        if "!-%%j:*列=!" equ "" set /a m+=1&set __!m!=%%j
        set "-%%j=!-%%j! %%i列"
    )
)
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