Command line in Terminal !

Is there a command or commands that can be ran in the terminal to see if the ethernet port is active or turned off?
Don
iMac G5   Mac OS X (10.4.6)  

Frank,
It doesn't matter what I plug into the ethernet port on this iMac G5. It won't show anything.
sidenote: I was having similar problem on my ibook connecting to video camera. I did get a green lite on connecting the camera at the hub. But, not the ibook. After finally getting the IP down right on the ibook. It connected instantly. Right now my ethernet is set to connect automatically without dns servers listed. This works well with airport. If I make new location I have no other option than connect using PPP in the TCP/IP. Now if I can set my IP that might make a difference. I can't. I'm issued a different IP each sign in. When it was working I had dns servers configured. Now when I do that it does not. There might have been something else that got turned on in the process but, I have no idea what it was. And in reality I am not able to connect to anything whether it is a known good cable or device. I can only assume 2 things. The actual port is dead. Or reinstall 10.4.6.

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