$ ip -br link | awk '!/LOOPBACK/ { print $1,$3 }'
eth0 0a:1b:2c:3d:4e:5f

$ ip -o link | awk '/ether/ { sub(/:/,"",$2); print $2,$17 }'
eth0 0a:1b:2c:3d:4e:5f

$ ip link | awk '!/loopback|LOOPBACK/ {print $2}' | xargs -n 2
eth0: 0a:1b:2c:3d:4e:5f

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