terse

这样？

@echo off
setlocal enabledelayedexpansion
for /f "tokens=* delims=" %%a in ('type port.txt^|findstr /c:":"') do (
     for /f "tokens=3,5 delims=:.= " %%i in ("%%a") do (
           if defined _%%i (echo !_%%i! %%j) else set "_%%i=%%j"
     )
)
pause
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