how do you tell if a line is up instead of the card/NIC status?

From: Flip ([remove)
Date: 03/30/04 

Date: Tue, 30 Mar 2004 14:46:07 -0500

By doing a ifconfig I'm able to identify if the card is up. However, if
there is no physical wire connected to that card/interface, how do I find
this out at a script level?

Any help would be appreciated. Thank you.

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