From: Nuby Ruby <nubyruby@...>
Date: 2007-08-29T15:10:13+09:00
Subject: Re: Help parsing simple structured data.

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Dan,

That works perfectly, thank you a lot! This type of data I end up dealing
with day-in and day-out, and this will help a lot.

Craig

On 8/28/07, Dan Zwell <dzwell@gmail.com> wrote:
>
> Nuby Ruby wrote:
> > I'm rather new to Ruby and am trying to figure out how to parse some
> > structured data.. This is pretty much the most common problem I run into
> > and it'd be *really* helpful to see an example to wrap my head around
> blocks
> > & hashes
> >
> > The data I'm working with is the output of `df -h` which looks like this
> :
> >
> >
> > Filesystem            Size  Used Avail Use% Mounted on
> > /dev/md0              9.9G  1.6G  7.8G  17% /
> > /dev/md1               60G  154M   57G   1% /data
> > /dev/sda1              99M   12M   83M  13% /boot
> >
> > In the end what I'd like to end up with is to be able to say print
> > hash[md0(size)] and have it
> > return 9.9G or hash[sda1(Mount)] and have it show the mountpoint of
> /boot
> >
> > If anyone could help I'd really appreciate it.
> >
> > Craig
> >
>
> Try this:
>
> rows = `df -h`.split("\n")[1..-1]
> hash = Hash.new {|hash, key| hash[key] = {}}
> rows.each do |row|
>    data = row.split /\s+/
>    device = data[0].sub(%r|^/dev/|, "")
>    %w{size  used  avail  use  mount}.each_with_index do |field, column|
>      hash[device][field] = data[column+1]
>    end
> end
>
> After running it, you should be able to find your data in
> hash["md0"]["size"] or hash["sda1"]["mount"].
>
> Does this work for you?
>
> Dan
>
>

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