中国DOS联盟

@echo off&setlocal enabledelayedexpansion
for /f "tokens=*" %%a in (a.txt) do (
  set "string=%%a"&set "str=%%a"
  if "!str:~0,1!"=="。" echo 。&echo.
  call :loop
  if "!str:~-1!"=="。" echo 。&echo.
)
:loop
for /f "tokens=1,* delims=。" %%i in ("!string!") do (
  set string=%%j
  if defined string (
    set/p=%%i。<nul
    echo.&echo.
    goto loop
  ) else (
    set/p=%%i<nul
  )
)

@echo off&setlocal enabledelayedexpansion
for /f "delims=" %%i in (a.txt) do call :loop "%%i"
pause>nul
:loop
set "str=%~1"
for /f "tokens=1* delims=。" %%a in ("!var!%~1") do (
    if "%%b"=="" (
       if "!str:~-1!"=="。" (echo %%a。&echo.&set var=) else set "var=!var!%~1"
       goto :eof
     ) else echo %%a。&echo.&set var=&call :loop "%%b"
)
goto :eof

@echo off&setlocal enabledelayedexpansion
for /f "delims=" %%i in (a.txt) do (set str=%%i
    if "!str:。=!" neq "!str!" call :lp
    if defined str set /p=!str:。=!<nul
)
pause>nul&goto :eof
:lp
set var=%str%
if "%str:~,1%" equ "。" set /p=。<nul&echo.&echo.
set str=%str:。= %
if "%var:~-1%" neq "。" set str=%str%。
for %%i in (%str%) do (set var=%%i
    if "!var:~-1!" neq "。" set /p=%%i。<nul&echo.&echo.&set str=!str:%%i=!
)

sed "s/。/。\n/g" a.txt | sed "/。$/!s/\n//g"

sed "s/。/&\n\n/g" myfile.txt | sed ":nt; /。$\|^$/!{N;bnt};s/\n//g"

sed "s/。/&\n\n/g" a.txt | sed ":nt; /。$/!{N;b nt};s/\n//g;n"

sed "s/。/&\n\n/g" a.txt | sed "/^$/{:a;N;s/^\n$//;ta}" | sed ":a; /。$\|^$/!{N;ba};s/\n//g"