Network card cable connection query

[Alan Cox]

On Thu, 25 Sep 2008 11:15:56 +0100
"Dan Track" <dan.track at gmail.com> wrote:

> Hi
> 
> Is there a way to identify whether a network card has a rj45 cable
> plugged into it from linux?

ethtool
/sbin/ethtool eth0
Settings for eth0:
	Supported ports: [ TP ]
	Supported link modes:   10baseT/Half 10baseT/Full 
	                        100baseT/Half 100baseT/Full 
	                        1000baseT/Half 1000baseT/Full 
	Supports auto-negotiation: Yes
	Advertised link modes:  10baseT/Half 10baseT/Full 
	                        100baseT/Half 100baseT/Full 
	                        1000baseT/Half 1000baseT/Full 
	Advertised auto-negotiation: Yes
	Speed: 1000Mb/s
	Duplex: Full
	Port: Twisted Pair
	PHYAD: 0
	Transceiver: internal
	Auto-negotiation: on
	Supports Wake-on: pg
	Wake-on: d
	Current message level: 0x000000ff (255)
	Link detected: yes