[CentOS] GRabbing MAC address

On Thu, 28 Feb 2008, Paul Heinlein wrote:

> On Thu, 28 Feb 2008, Wojtek Pilorz wrote:
>> On Thu, Feb 28, 2008 at 08:13:17AM -0600, Les Mikesell wrote:
>>> Jerry Geis wrote:
>>>> I am trying to grab the mac address for eth0 on centos 5.1 with
>>>> 
>>>> ifconfig | grep eth0 | cut -d ' ' -f 5 and I dont get anything.
>>>> 
>>>> What am I not doing right?
>>>> 
>>>> ifconfig | grep eth0 | cut -d ' ' -f 1 gives me eth0 but anything else 
>>>> like -f 2, -f 3 etc I get nothing.
>>> 
>>> If sed had been invented first, we wouldn't need grep.
>>> 
>>> ifconfig |sed -n -e 's/eth0.*\(..:..:..:..:..:..\)/\1/p'
>
> Or awk! :-) And you can ditch ifconfig entirely and use /sbin/ip,
> which defaults to a lower-case version of the MAC rather than the
> upper-case presentation used by ifconfig:
>
>  ip link show eth0 | awk '/ether/ {print $2}'

ip also has a one-line output mechanism:

 	ip -o link show

which could lead you to:

 	ip -o link show | awk '/ether/ { print $2 " " $11 }'

-- 
--   dag wieers,  dag at centos.org,  http://dag.wieers.com/   --
[Any errors in spelling, tact or fact are transmission errors]