尘丶

@echo off&setlocal enabledelayedexpansion
set /p a=<a.txt
for /f %%n in (a.txt) do (
    set b=%%n
  
)
echo %a%!b!
pause
复制代码

尘丶

1.

@echo off&setlocal enabledelayedexpansion
for /f "delims=" %%a in (1.txt) do (
set s=%%a
set /a n+=1
if !n!==1 set /p=%%a<nul
echo;%%a>nul
)
echo;!s!
pause
复制代码

2.

@echo off&setlocal enabledelayedexpansion
for /f "delims=" %%a in (1.txt) do set /p n=<1.txt&set s=%%a
echo;!n!!s!
pause
复制代码

3.

@echo off&setlocal enabledelayedexpansion
(for /l %%a in (1,1,20) do set /p n%%a=)<1.txt
echo;!n1!!n18!
pause
复制代码