netdev - Re: A robust correct way to display local ip addresses of the device Gautieji x

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Date:   Tue, 31 Mar 2020 15:08:36 +0200
From:   Matthias May <matthias.may@...atec.com>
To:     Vaidas BoQsc <vaidas.boqsc@...il.com>, netdev@...r.kernel.org
Subject: Re: A robust correct way to display local ip addresses of the device
 Gautieji x

On 30/03/2020 18:49, Vaidas BoQsc wrote:
> Are there any ways to output only the local ipv4 (inet) addresses of
> the device using ip command?
> 
> I tired this way and both UNKNOWN, Down are not filtered away. Is my
> usage of syntax incorrect?
> 
>  ip --brief address show up
> lo               UNKNOWN        127.0.0.1/8 ::1/128
> enp7s0           DOWN
> wlp8s0           UP             192.168.0.103/24 fe80::22c:79e4:a646:a7b/64
> 
>   Even so, if enp7s0 and lo were filtered, I would still want an
> output of simply 192.168.0.103 from ip command which can't be provided
> without piping into other tools?
> 

Hi

Is enp7s0 actually down, or does it just not plugged in?

Example:
ip -br l show wlan0
wlan0            DOWN           b6:91:7e:4e:94:01
<NO-CARRIER,BROADCAST,MULTICAST,UP>

wlan0 is UP, but has NO-CARRIER, resulting in a state of DOWN.


To filter out ipv6 results, simply only request ipv4:

ip -4 -br a show up

BR
Matthias