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RBarryYoung
Asked: 2013-01-15 14:30:18 +0800 CST

How to Extract command-line output into a Variable?

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As part of a task that I am working on for a customer, I need to make some modifications to the enterprise logon script. Windows command-line is definitely not my area of expertise, but I am doing OK with most it. However, I have one problem that I cannot figure out how to do.

Basically, I need to get the IP address of the machines default gateway into an environment variable (for later use in the script). I know that it exists in the output of both ipconfig and of tracert, and I know how to find the exact line in their output that I need, but I cannot figure out how to get beyond that.

For example, the following command produces output like this:

>ipconfig|Find "Default Gateway"|Findstr/N "."|Findstr/B "1:"

 1:   Default Gateway . . . . . . . . . : 199.99.9.1

But now I need to somehow extract only the IP address out of this text line and then assign it to an environment variable. So, how can I do that from a Windows command-line? (Windows XP and higher).

windows

1 Answers

  1. Best Answer

    for /f is your friend. 

    for /f "usebackq tokens=1,2,3 delims=:" %A in (`ipconfig ^| Find "Default Gateway" ^| Findstr/N "." ^| Findstr/B "1:"`) do @if not defined MYVAR set MYVAR=%~C

    ...might do the trick.

    Edit: changed the code block to read the third value not the second, and needed to escape the pipes.

    You could also shorten to:

    for /f "usebackq tokens=1,2,3 delims=:" %A in (`ipconfig ^| Find "Default Gateway" ^| Findstr/N "."`) do @if not defined MYVAR set MYVAR=%~C

    ...as, technically, the second findstr (where you limit to the first result) is actually handled by the if not defined

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