@echo off
for /f "tokens=2 delims=:" %%i in ('ipconfig^|findstr/ic:"IP Address"') do (
set ip=%%i
)
for /f "tokens=1* delims=:" %%i in ('findstr/n ".*" a.txt') do (
if %%i equ 6 (echo     PublicIP =%ip%) else (echo.%%j)
)
pause
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@echo off&setlocal enabledelayedexpansion
for /f "tokens=2 delims=:" %%i in ('ipconfig /all^|findstr /c:"IP Address"') do set "ip=%%i"
set "ip=%ip:~1%"
for /f "delims=" %%a in ('type a.inf') do (
     set /a n+=1
     if !n! equ 1 (
        echo %%a>a.inf
        ) else (
        if !n! equ 6 (
           echo PublicIP = %ip%>>a.inf
           ) else (
           echo.%%a>>a.inf
        )
    )
)
start a.inf
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@echo off&setlocal enabledelayedexpansion
for /f "delims=" %%a in ('type a.txt') do (
set /a n+=1
if !n! equ 1 (
echo %%a>a.txt
) else (
if !n! equ 6 ( rem 6 就是指要被修改的所在行数
echo 这里输入修改的内容 >>a.txt
) else (
echo.%%a>>a.txt
)
)
)
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