batch file IF condition

Question

I'm trying to get the current active connection with netsh (i'd rather not use wmic) using the following code.

@echo off

FOR /F "tokens=3,*" %%A IN ('netsh interface show interface^|findstr /i "\<connected\>"') DO (

if %%B == .........
)

I only want to account for the default connection names:

Wi-Fi, Ethernet, Wireless Network Connection, Local Area Connection and do something based on that.

eg: if %%B = WiFi or Ethernet or....(

::do something here )

I only want "something" to be executed once because only 1 of those connections will ever be active at any given time.

Answer 1

I think something like this ought to do the trick:

@echo off

SETLOCAL ENABLEDELAYEDEXPANSION

for /f "tokens=3,*" %%a in ('netsh interface show interface ^| findstr /i "\<connected\>"') do (
    set ifname=%%b
    if "!ifname:~0,8!"=="Ethernet" goto execute
    if "!ifname:~0,21!"=="Local Area Connection" goto execute
    if "!ifname:~0,5!"=="Wi-Fi" goto execute
    if "!ifname:~0,27!"=="Wireless Network Connection" goto execute
)
echo No connected interface found, exiting...
goto :EOF

:execute
echo Found connected interface (%ifname%), executing...
:: do whatever you need

Basically the idea is to look for interfaces that begin with those four different strings, then jump to the label that executes whatever it is you want.

[I'd be remiss if I didn't point out that this is likely better to be done in PowerShell nowadays, but…]

Answer 2

Here's an untested example, which is supposed to just tell you the interface name of the device associated with your only assigned IP Address.

@Echo Off
SetLocal EnableExtensions
For /F "Delims==" %%G In ('"(Set Interface) 2> NUL"') Do Set "%%G="
For /F Tokens^=4 %%G In ('%__APPDIR__%ROUTE.EXE -4 PRINT 0.0.0.0 ^
 ^| %__APPDIR__%findstr.exe /RC:"0.0.0.0 *0.0.0.0"') Do (Set "InterfaceIP=%%G"
    For /F Tokens^=5* %%H In ('%__APPDIR__%netsh.exe interface IP show route^
 ^|%__APPDIR__%find.exe "%%G"') Do Set "InterfaceName=%%I")
If Not Defined InterfaceIP GoTo :EOF
Set Interface & Pause

[EDIT /]

Here's a slightly modified version of the example from my comments which uses ping.exe instead of ROUTE.EXE for returning the IP Address used to determine the Interface Name.

@Echo Off
SetLocal EnableExtensions
For /F "Delims==" %%G In ('"(Set Interface) 2> NUL"') Do Set "%%G="
For /F "Tokens=2 Delims=[]" %%G In ('^"%__APPDIR__%ping.exe "%COMPUTERNAME%" ^
 -n 1 -4 2^> NUL ^| %__APPDIR__%find.exe /I "%COMPUTERNAME%"^"') Do (
    Set "InterfaceIP=%%G" & For /F Tokens^=5* %%H In ('%__APPDIR__%netsh.exe ^
     interface IP show route ^| %__APPDIR__%find.exe "%%G"'
    ) Do Set "InterfaceName=%%I")
If Not Defined InterfaceIP GoTo :EOF
Set Interface & Pause

---

The last line in both examples just displays the two variables so that you can see them. You'd obviously replace those with the rest of your code.