How to print a list of tshark interfaces to a txt file?

Question

Looks simple but is annoying...

dumpcap.exe -D >> interfaces.txt

or:

tshark.exe -D >> interfaces.txt

Because interface numbers can be different among different machines, i want to use this command to sort out the Local Ethernet Cable connection and use it as a variable in my tshark script after sorting this out first... but i can't seem to print a list to a txt file?!

Thanks!

Accepted Answer

Thats because the output of dumpcap -D isn't printed to stdout, but to stderr, and what you're trying to do is to redirect stdout to a file. So you need to redirect stderr instead.

Try this: dumpcap -D 2>interfaces.txt, where the "2>" stands for "please redirect stderr".

See this Microsoft Ressource for a detailed explanation of the redirecting of handles.