Get interface name into linux shell script variable

Question

I would like to store an interface name into a variable in linux shell script. I found a solution to do this via "grep" command and the IP-Address. My problem is that my interface doesn't have an IP-Address at this moment.

The interface name always begins with "enx" and the MAC-Address like "enxb2240be99fc3" while the MAC-Address can change every reboot.

Is there a solution to get this interface name into a shell script variable?

Please be more specific.. Give example inputs, expected outputs etc. — Fazlin
– Fazlin, Commented Jul 4, 2016 at 11:28
Ok, for example: i get 3 interface names with"ls /sys/class/net". One of those names is "enxb2240be99fc3" (MAC-Address changes every reboot). I only want this one extracted into a variable in shell script. — D.W.
– D.W., Commented Jul 4, 2016 at 11:54

jijinp · Accepted Answer · 2016-07-04 11:49:38Z

6

iname=$(ip -o link show | sed -rn '/^[0-9]+: en/{s/.: ([^:]*):.*/\1/p}')

save the interface name to variable iname

answered Jul 4, 2016 at 11:49

jijinp

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Hryhorii Pavlenko · Accepted Answer · 2019-07-25 13:51:10Z

2

iname=$(ls /sys/class/net | grep -i enx)
echo $iname

edited Jul 25, 2019 at 13:51

Hryhorii Pavlenko

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answered Jul 25, 2019 at 12:42

eryo05

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Yash Shah · Accepted Answer · 2018-12-05 09:32:32Z

1

ip addr show | awk '/inet.*brd/{print $NF}'

this is also works,check it...

answered Dec 5, 2018 at 9:32

Yash Shah

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1 Comment

amkawai Feb 11 at 20:08

Tested here and returned all interfaces... Need to append a "| grep -i en" on this command.

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