@echo off
setlocal enabledelayedexpansion
(for /f "tokens=1,2* delims=:" %%i in ('findstr /n . A.txt') do (
    set str=
    set /p str=
    if "%%j" neq "!str!" echo;%%i:%%j&echo;%%i:!str!
))<B.txt
pause
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grep -vxFf a.txt b.txt > 1.txt
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grep -vxFf b.txt a.txt > 2.txt
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grep -vxFf a.txt b.txt | more > 1.txt
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grep -vxFf b.txt a.txt | more > 2.txt
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