Find MAC address of Active Eth connection

/sbin/ifconfig|grep -B 1 inet |head -1 | awk '{print $5}'

By: octopus
2010-04-22 06:35:29

What Others Think

not every machine has only one NIC...
buzzy · 649 weeks and 1 day ago
This is not for one mac address. it will find the active eth connection and show you the mac address.
octopus · 649 weeks and 1 day ago
It shows the first ethernet connection. Could be that eth0 is not active, but eth1. And on FreeBSD it won't work.What you need to do is actually search for the MAC adress: /sbin/ifconfig|grep ..:..:..:..:..:..|awk '{print $1" "$NF}' This will show the name and the IP adress.
houghi · 649 weeks and 1 day ago
Here's a perlized variant: /sbin/ifconfig|perl -lane 'print "$F[0] $F[$#F]" if /(..:){5}/' though on a BSD box, netstat may be saner (with this particular command): /bin/netstat -i|perl -lane 'print "$F[0] $F[3]" if /(..:){5}/'
zerokey · 649 weeks and 1 day ago

What do you think?

Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

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