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Re: [Xen-tools] [PATCH] Add a --format parameter to xm list

To: Anthony Liguori <aliguori@xxxxxxxxxx>
Subject: Re: [Xen-tools] [PATCH] Add a --format parameter to xm list
From: Rusty Russell <rusty@xxxxxxxxxxxxxxx>
Date: Thu, 11 Aug 2005 12:39:30 +1000
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On Wed, 2005-08-10 at 17:21 -0500, Anthony Liguori wrote:
> The following patch adds a --format option to xm list which let's you 
> specify a python formatting string to use.  Since we're using named 
> keys, it ends up working very nicely.  The above can be done with:
> res=`xm list -f "%(mem)d" $VM`
> Which is considerably nicer and more robust against slight changes in 
> the display format.

I know several tools go this way, but actually prefer one or more "-f
<fieldname>" args, and an "-s <seperator>" (or -0 for a nul) arg.  That
makes getting a single field very easy, without doing formatting in xend
which people might start to rely on.

This is analogous to the "old modinfo" vs "new modinfo" where I decided
to do it this way.

A bad analogy is like a leaky screwdriver -- Richard Braakman

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