windows - how to create a batch script for replacing the string in a file with out creating a new file for output -


i creating script finds old ip , replace new ip in given input file. have followed examples internet , wrote following script 

@echo off&setlocal   setlocal enabledelayedexpansion   /f "tokens=2 delims=:" %%f in ('ipconfig ^| findstr /ic:"ipv4 address"') set ip=%%f   set ip1=%ip:~1%   echo %ip1%   set "search=old ip"   set "replace=new ip"   set "textfile=sample.txt"   set "newfile=output.txt"   set outputline=   /f "tokens=1,* delims=¶" %%a in ( '"findstr /n ^^ %textfile%"') (     set string=%%a     /f "delims=: tokens=1,*" %%a in ("!string!") set "string=%%b"     if  "!string!" == "" (         echo.>>%newfile%     ) else (         set modified=!string:%search%=%replace%!         echo !modified! >> %newfile%     ) )   del %textfile%   rename %newfile% %textfile%   )   )   endlocals

but not interested create new file , need modify data in same file self avoid error occurrences. please 1 me on this.


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