netdev - Re: ip route show shows the routes in the inverse order?

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Message-ID: <20120313223243.7d0ebf1f@nehalam.linuxnetplumber.net>
Date:	Tue, 13 Mar 2012 22:32:43 -0700
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Bill Fink <billfink@...dspring.com>
Cc:	Ben Greear <greearb@...delatech.com>,
	David Miller <davem@...emloft.net>, diego@...tasen.com.ar,
	netdev@...r.kernel.org
Subject: Re: ip route show shows the routes in the inverse order?

On Wed, 14 Mar 2012 01:30:21 -0400
Bill Fink <billfink@...dspring.com> wrote:

> On Tue, 13 Mar 2012, Ben Greear wrote:
> 
> > On 03/12/2012 11:52 PM, David Miller wrote:
> > > From: Bill Fink<billfink@...dspring.com>
> > > Date: Tue, 13 Mar 2012 02:15:29 -0400
> > >
> > >> Some scripts may depend on this plus its much more efficent that way
> > >> if trying to find a matching route since you can quit on the first
> > >> match instead of having to scan the entire routing table.
> > >
> > > No script should be doing stuff like this, let the tool do it for you
> > > via "ip route get ADDR"
> > >
> > > There is absolutely no argument for routes to be listed in one order
> > > or another, and anything depending upon order is extremely fragile
> > > and needs to be fixed up anyways.
> > 
> > The argument is ease of use by whatever human is reading the
> > information..but it could be done in the 'ip' tool.
> > 
> > Humans are fragile indeed, but it's often easier to fix the
> > computer than fix the humans.
> 
> Speaking from experience, it's a royal point to look at unsorted
> routes.  Perhaps it would be useful to add a sort option to the
> "ip route show" command.
> 
> It makes more sense to fix a single user tool like "ip" than make
> hundreds (or thousands) of admins work around the new behavior.
> 
> 						-Bill

patches accepted.
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