WinBatch - Codigo For /f para buscar y agregar lineas en un TXT.

@echo off

SETLOCAL ENABLEDELAYEDEXPANSION

set inputFile=C:\Users\sumam\Desktop\Nueva carpeta\Nueva carpeta\test.txt

set outputFile=C:\Users\sumam\Desktop\Nueva carpeta\Nueva carpeta\testSOout.txt

set _strInsert=NUEVO

set _strFind=OLD

set i=0

FOR /F "usebackq tokens=1 delims=[]" %%X IN (`FIND /N "%_strFind%" "%inputFile%"`) DO (set _strNum=%%X

echo %%X FILA DE ENCUENTRO

pause)

FOR /F "usebackq delims=" %%A IN ("%inputFile%") DO (

set /a i = !i! + 1

echo %%A LINEA

ECHO %!i! CONTADOR

ECHO %_strNum% EVALUADOR

pause

ECHO %%A>>"%outputFile%"

IF [!i!] == [%_strNum%] (

ECHO %_strInsert%>>"%outputFile%"

ECHO NUEVA LINEA 2>>"%outputFile%"

)

)