中国DOS联盟

@echo off&setlocal enabledelayedexpansion
for /f "delims=" %%i in (1.txt) do (
    set str=%%i
    if "!str!" equ "[abcd]" (
       echo.&echo !str!
       ) else (
       echo !str!
    )
)
pause>nul

@echo off
for /f "delims=" %%i in (1.txt) do (
if %%i==[abcd] echo.
echo %%i
)
pause>nul

@echo off
for /f "delims=" %%a in (a.txt) do (
   if "%%a"=="[abcd]" echo.
   echo %%a
)
pause

@echo off&setlocal enabledelayedexpansion
for /f "delims=" %%i in (1.txt) do (
set "str=%%i"
if "!str:~0,1!"=="[" echo.
echo %%i
)
pause>nul

@echo off
for /f "delims=" %%i in (1.txt) do (
echo %%i|findstr "^[.*]$">nul&&echo.
echo %%i
)
pause>nul