On Fri, Apr 23, 2021 at 09:59:09PM -0500, David Wright wrote:
> OTOH my startup files set Mywiredifname for scripts to use, where:
>
> Mywiredifname=$(ip -o link show | sed -e '/^[0-9]\+: [^e]/d;s/[0-9]\+:
> \([^:]\+\): .*/\1/;q')
>
> $ echo $Mywiredifname
> enp3s0
unicorn:~$ ip -o link show | awk -F': ' '{print $2}'
lo
lan0
You're relying on the "default" names which ensure that an ethernet
interface begins with an 'e', so we could fold that in as well:
ip -o link show | awk -F': ' '$2 ~ /^e/ {print $2}'
It's slightly prettier than yours, and doesn't rely on GNUisms (which are
probably not a big issue since a system with "ip" probably has GNU sed).
> (My days of running multiple ethernet cards are long gone,
> so sed will quit after one match.)
Sounds like a naive assumption. Some motherboards have dual NICs built in,
don't they?
