lvsehuaxue

@echo off
(findstr /i "internetaddress fullname mailfile" a.txt)>b.txt
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lvsehuaxue

@echo off&setlocal enabledelayedexpansion
(findstr /i "internetaddress fullname mailfile" a.txt)>$ 
(for /f "tokens=1,2 delims=: " %%i in ($) do (
    set /a n+=1
    set v=!v!,%%j
    if !n!==3 echo !v:~1!&set "v="&set n=0
)>b.txt 
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