BAT:文件中替换字符(保留空格和换行)

 @echo off
 rem CMD:"color --help"
 :: setting color:back white,content blue
 color f9

 ::old string and replace string
 set old_str=ip
 set new_str=#ip

 :FILE
 set "souerce_path=D:\xxx\bat\my_test.txt"
 for /f "tokens=1* delims=:" %%i in ('findstr /n .* "%souerce_path%"') do (
     set "lineContent=%%j"
     ::echo ==%%j==
     setlocal EnableDelayedExpansion
     if not "!lineContent!"=="" set "lineContent=!lineContent:%old_str%=%new_str%!"
     >>"temp.txt" echo.!lineContent!
     endlocal
 )
 move /y temp.txt "%souerce_path%"
 goto END

 :PATH
 ::files path
 set "souerce_path=D:/xxx/bat"
 cd /d "%souerce_path%"

 :: dir /s /b /a-d *.txt  ::get all current and sub path file name with post .txt
 for /f "delims="  %%a in ('dir /s /b /a-d *.txt') do (
     for /f "tokens=1* delims=:" %%i in ('findstr /n .* "%%a"') do (
         set "lineContent=%%j"
         ::echo ==%%j==
         ::here use "setlocal EnableDelayedExpansion" to keep content "!"
         setlocal EnableDelayedExpansion
         if not "!lineContent!"=="" set "lineContent=!lineContent:%old_str%=%new_str%!"
         >>"%%~dpnxas" echo.!lineContent!
         endlocal
     )
     del /s /q /f "%%a" >nul
     ren *.txts *.txt
 )
 :END
 echo   ---------ok----------
 pause>nul