CrLf

这么大的文件只能先 sort 再逐行对比了

CrLf

@echo off
(for /f "tokens=1* delims=," %%a in ('sort 1.txt') do (
   set str=%%a
   setlocal enabledelayedexpansion
   if !last!==!str! echo !str!,%%b
   endlocal
   set last=%%a
))>重复.txt
复制代码

CrLf

用临时文件就快了，前两行可做如下改动：

@echo off
sort a.txt /o tmp.txt
(for /f "tokens=1* delims=," %%a in (tmp.txt) do (
...
复制代码