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. Jerry
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. > > Jerry >There's multiple spaces in the output that cut is hitting - use tr to reduce them. ifconfig | grep eth0 | tr -s ' ' ' ' | cut -d ' ' -f 5 -- Toby Bluhm Alltech Medical Systems America, Inc. 30825 Aurora Road Suite 100 Solon Ohio 44139 440-424-2240
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' -- Les Mikesell lesmikesell at gmail.com
On Thu, Feb 28, 2008 at 8:47 AM, Jerry Geis <geisj at pagestation.com> 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. > >ifconfig -a | awk '/eth0/ {print $5}' should work even if eth0 is not 'UP' -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.centos.org/pipermail/centos/attachments/20080228/1a93cafa/attachment.html>