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Date:   Wed, 19 Jan 2022 16:39:38 -0700
From:   David Ahern <>
To:     Stephen Hemminger <>,
        Petr Machata <>
Cc:, Maksym Yaremchuk <>
Subject: Re: [PATCH iproute2] dcb: app: Add missing "dcb app show dev X

On 1/19/22 1:35 PM, Stephen Hemminger wrote:
> On Wed, 19 Jan 2022 11:38:54 +0100
> Petr Machata <> wrote:
>>> In general, we are not allowing more uses of matches(). I think this one
>>> can be an exception for consistency with the other options, so really
>>> just a heads up.  
>> The shortening that the matches() allows is very useful for typing. I do
>> stuff like "ip l sh dev X up" and "ip a a dev X" all the
>> time. I suppose there was a discussion about this, can you point me at
>> the thread, or where & when approximately it took place so I can look it
>> up?
> The problem is that matches() doesn't handle conflicts well.
> Using your example:
>   ip l 
> could match "ip link" or "ip l2tp" and the choice of "link" is only because
> it was added first. This is bad UI, and creates tribal knowledge that makes
> it harder for new users. Other utilities don't allow ambiguous matches.

and the constant source of bugs when new options are added. This patch
being a good example as Stephen noted.

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