How can I see using command-line whether I am connected to network using eth0, eth1 or wln0 etc?

Well, to elaborate, I have a desktop sidebar which I installed using program "conky". This sidebar has meter that shows internet speed. Since I am not using eth0, I need to make a minor change in ~/.conkyrc file. I need to replace "eth0" with whatever network is being used by my wireless card to connect to internet (via a router).

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1 Answer

You may very well be connected to multiple networks at once, depending on your setup.

If you are interested in knowing which interface is being used for Internet traffic, try using the ip route command and look at the default route. For example, on my system it shows that traffic will travel over eth0 if it isn't matched by any of the other rules in the table:

$ ip route
default via 192.168.0.1 dev eth0 proto static
169.254.0.0/16 dev eth0 scope link metric 1000
192.168.0.0/24 dev eth0 proto kernel scope link src 192.168.0.10 metric 1 

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