apang

@echo off&setlocal enabledelayedexpansion
md "B" 2>nul
for /f "delims=" %%a in ('find /i "xyz"^<test.txt') do (
  set /a n+=1
  echo,%%a>"B\!n!.txt"
)
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@echo off&setlocal enabledelayedexpansion
(for /f "delims=" %%a in (test.txt) do (
  set "a=!b!"
  set "b=%%a" 
  if defined a if "!b:xyz=!" neq "!b!" echo,!a!
))>test1.txt
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