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GREP mac address

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# 1  
Old 11-08-2014
GREP mac address
Hi,

mac.txt
My mac address is <Mac Address>.

How can i replace <Mac Address> with the actual of my computer?
I try to GREP command as below but i am unable to grep it to replace just <Mac Address>.
Code:
ifconfig eth0 | grep -o -E '([[:xdigit:]]{1,2}:){5}[[:xdigit:]]{1,2}'

Million in Advance.


Moderator's Comments:
Mod Comment Please use code tags next time for your code and data. Thanks

Cheers
Last edited by vbe; 11-08-2014 at 08:22 AM..
# 2  
Old 11-08-2014
There's many a solution to your problem. One of them:
Code:
sed "s/<Mac Address>/$(ifconfig eth0 | grep -o -E '([[:xdigit:]]{2}:){5}[[:xdigit:]]{2}')/" mac.txt
My mac address is 00:1f:c6:4c:d0:e2.

# 3  
Old 11-08-2014
Just awk?

Code:
awk 'NR==FNR {mac=$0;next} {sub(/<Mac Address>/, mac)}1' /sys/class/net/eth0/address mac.txt

Last edited by Aia; 11-08-2014 at 03:02 PM.. Reason: more idiomatic
# 4  
Old 11-28-2014
Hi,

thanks for all the suggestion but can i make it replace it in the actual file. What i want is the <Mac Address> will be replaced by the actual mac add in the file. Thanks.

Cheers
# 5  
Old 11-29-2014
Redirect the output of your command to a temporary file, and, when correct, mv (overwrite) that to the original file.
Some sed implementations have the -i (in place) option to overwrite immediately.
# 6  
Old 12-07-2014
Many thanks for all the help. I am close to achieve what i want.
I do not want the ":" which is uses another command line to remove

Code:
sed s/://g /usr/local/id.txt

but how can i merge it to the below command?

Code:
sed -i "s/<user>/$(ifconfig eth0 | grep -o -E '([[:xdigit:]]{2}:){5}[[:xdigit:]]{2}')/" /usr/local/id.txt

MTIA
Last edited by Don Cragun; 12-07-2014 at 07:08 AM.. Reason: Add CODE tags.
# 7  
Old 12-07-2014
How would you surmise this could be done?
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