CrLf

那要是第六行原来就有内容呢？替换？还是挪到下一行？

CrLf

@echo off&setlocal enabledelayedexpansion
for /f "tokens=1* delims=:" %%a in (findstr /n .* 1.txt) do (
   if %%a==6 (echo bb) else echo %%b
)
pause
复制代码

@echo off&setlocal enabledelayedexpansion
for /f "delims=" %%a in (1.txt) do (
   if !h! leq 6 set /a n+=1
   if !h! neq 6 (echo %%a) else echo bb
)
pause
复制代码

@echo off&setlocal enabledelayedexpansion
for /l %%a in (2 1 6) do (
   set str=
   set /p str=
   echo !str!
)<1.txt
echo bb
more +6 1.txt
复制代码