用指定字符串替换指定内容

@echo off 
setlocal enabledelayedexpansion 
set file= 
set /p file= 请输入要操作的文件名称(包括扩展名)： 
set "file=%file:"=%" 
for %%i in ("%file%") do set file=%%~fi 
echo. 
set replaced= 
set /p replaced= 请输入即将被替换的内容： 
echo. 
set all= 
set /p all= 请输入替换字符串： 
for /f "delims=" %%i in ('type "%file%"') do ( 
set str=%%i 
set "str=!str:%replaced%=%all%!" 
echo !str!>>"%file%"_tmp.txt 
) 
copy "%file%" "%file%"_bak.txt >nul 2>nul 
move "%file%"_tmp.txt "%file%" 
start "" "%file%"