@echo off & setlocal EnableDelayedExpansion
pushd "%~dp0"

call :SAME_STRING "%1"
del /q *.tmp
for /f "delims=" %%a in ('dir/a-d/b/s "%~1\*.txt"') do (
    pushd "%%~dpa"
    if %n% geq 1 (
    (for /f "skip=%n% delims=" %%e in ('type "%%~nxa"') do echo %%e)>new.log
    if /i not exist "%%~nxa.bak" ren "%%~nxa" "%%~nxa.bak"
    rem 如不想备份 把上句改为 del /q "%%~nxa"
    ren new.log "%%~nxa") else echo 开头没有发现重复的行
   popd
   )
popd
pause & exit

:SAME_STRING
for /f "delims=" %%a in ('dir/a-d/b/s "%1\*.txt"') do (
  set /a n+=1
  copy /y "%%~fa" !n!.tmp>nul 2>nul
  if !n! gtr 1 (
    set /a n=0
    for /f "delims=" %%a in ('type 1.tmp') do findstr /ix /c:"%%a" 2.tmp>nul 2>nul && set /a n+=1||goto :eof
    goto :eof)
  )
复制代码