Hello Antony,
pá 20. 9. 2019 v 11:09 odesílatel Antony Antony <[email protected]> napsal:
> programs/_updown.netkey/_updown.netkey.in
> - if [ -r /sys/class/net/${iface}/address ]; then
> - macaddr=$(cat /sys/class/net/${iface}/address)
> + if ip -o link show dev ${iface}; then
> + macaddr=$(ip -o link show dev ${iface} | awk '$2 !=
> "${iface}:" {print $(NF-4)}')
>
> I am not sure "NF-4" is good idea. The fear is a hardcoded position of the
> MAC address may not very portable to older versions "ip". Will it be always
> at a -4 in "ip -o" output. If not we need an awk magic line.
>
> Tuomo, would you write a better awk oneliner?
I'm not Tuomo, but are we limited to 'awk'? Can you go with e.g. sed?
(+ -- to match even for interfaces with longer MAC addresses, I've
seen it with some storage devices)
# sed -E 's/.*ether\ ([0-9a-f:]{17}+)\ brd.*$/\1/'
> Also this has two "ip -o" calls may be we can do in one?
I think you don't need to check for the "ip -o" return value, $macaddr
will be an empty string when the device does not exist.
Have fun,
Stepan
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