terse

@echo off&setlocal enabledelayedexpansion
rem 存为ansi文件
for /f "tokens=10 delims=," %%a in (a.csv) do set /a _%%a+=1
(echo;序号,采样点,试管码,管长,人数,阳性
for /f "skip=1 tokens=1,7,10 delims=," %%a in (a.csv) do (
     set /a n+=1
     echo;!n!,%%b,%%c,%%a,!_%%c!,1
))>b.csv
pause
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