getting a list of all machines of a specific OS

[Val Polyakov <vpolyakov (at) vmsinfo.com>]

Is there a way to get a list of all machines in Hobbit sorted by OS?

as in, here is a full list of Linux boxes, here's a full list of Solaris 
boxes, etc.

The OS details are in the info column, so I'm assuming there's a way

i'm currently doing this via this:

(in $HOBBITROOT/data/hostdata)

for i in `ls`
do 
        file=`ls -ltr $i | tail -1 |  awk '{print  $9 }'`
        echo "$i `cat $i/$file | grep -i 'red hat'`"
done

this is ugly and horrible, though (although functional).
any "correct" ways of doing the same thing?