Need simple algorithm for newbie

[William Park]

Jason Tudisco <tudisco at sexmagnet.com> wrote:
> I have a list of domains... Some of the domain names in the list look
> like this:
> 
> groups.goodle.com
> 
> The information I want is just google.com. I need to know the best way
> to do this.. for .com .net .org only.. and to strip the rest of the
> garbage.. like in this case.. get rid of groups in groups.google.com
> 
> I need to parse though a huge list so it has to be optimized algorithm
> 
> No need to write complete code.. Just get me in the right direccion..
> Still learning python and I am not sure what would be the fastest way
> to go about it..

I assume you only want the last 2 fields.  In that case, 

1. Python:
    a = 'groups.goodle.com'.split('.')
    a[-2:] 

2. Awk:
    echo 'groups.goodle.com' | gawk -F '.' '{print $(NF-1) "." $NF}'

3. Shell:
    a=groups.goodle.com
    b=${a%.*.*}
    echo ${a#$b.}

-- 
William Park, Open Geometry Consulting, <opengeometry at yahoo.ca>
Linux solution for data management and processing. 
1986 VW Jetta, 350000km :-))