tmplinshi

@echo off
set "file=a.txt"
set "str=bat"
findstr /n .* "%file%" >"%temp%\.tmp"
(for /f "usebackq delims=" %%a in ("%temp%\.tmp") do (
    set var=%%a
    SetLocal EnableDelayedExpansion
    if "!var:%str%=!" neq "!var!" echo,
    echo,!var:*:=!
    EndLocal
)) >"%file%"
del "%temp%\.tmp"
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