[文本处理] 求批处理如何将txt文本内容按指定行数合并成一行

@echo off&setlocal enabledelayedexpansion
(for /f "delims=" %%i in (a.txt) do (
   set /a n+=1
   if !n! leq 3 set str=!str!%%i-
   if !n! equ 3 (
      echo !str:~,-1!
      set n=
      set str=
   )
)
echo !str:~,-1!
)>$
move $ a.txt
复制代码

@echo off
(for /l %%a in () do (
   setlocal enabledelayedexpansion
   for %%b in (a b c) do set /p %%a=||exit
   echo !a!_!b!_!c!
   endlocal
))<a.txt >b.txt
复制代码