WHY

@echo off & setlocal enabledelayedexpansion
(for %%i in (*.txt) do (
    set "n="
    for /f "delims=" %%j in ('type "%%i"') do (
        set "s=%%j"
        if defined n (
            if !n! LEQ 10 set /a n+=1 & echo;!s!
        ) else (
            if "!s:abc=!" NEQ "!s!" set n=1
        )
    )
))>Result.Log
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WHY

PowerShell -c "Select-String -Path *.txt -Encoding Default 'abc' -Context 10|%%{$_.Context.PostContext}">Result.Log
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