netdev - Re: [PATCH iproute2 net-next 0/3] ss: Allow selection of columns to be displayed

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Message-ID: <20181101140623.4d6211a0@cakuba.netronome.com>
Date:   Thu, 1 Nov 2018 14:06:23 -0700
From:   Jakub Kicinski <kubakici@...pl>
To:     David Ahern <dsahern@...il.com>
Cc:     Stefano Brivio <sbrivio@...hat.com>,
        "Yoann P." <yoann.p.public@...il.com>,
        Stephen Hemminger <stephen@...workplumber.org>,
        netdev@...r.kernel.org
Subject: Re: [PATCH iproute2 net-next 0/3] ss: Allow selection of columns to
 be displayed

On Wed, 31 Oct 2018 20:48:05 -0600, David Ahern wrote:
> >   spacing with a special character in the format string, that is:
> > 
> > 	"%S.%Qr.%Qs  %Al:%Pl %Ar:%Pr  %p\n"
> > 
> >   would mean "align everything to the right, distribute remaining
> >   whitespace between %S, %Qr and %Qs". But it looks rather complicated
> >   at a glance.
> >   
> 
> My concern here is that once this goes in for 1 command, the others in
> iproute2 need to follow suit - meaning same syntax style for all
> commands. Given that I'd prefer we get a reasonable consensus on syntax
> that will work across commands -- ss, ip, tc. If it is as simple as
> column names with a fixed order, that is fine but just give proper
> consideration given the impact.

FWIW I just started piping iproute2 commands to jq.  Example:

tc -s -j qdisc show dev em1 | \
	jq -r '.[] |  [.kind,.parent,.handle,.offloaded,.bytes,.packets,.drops,.overlimits,.requeues,.backlog,.qlen,.marked] | @tsv'

JSONification would probably be quite an undertaking for ss :(