Thanks Eric.  Those are what I was going to use before I had the thought that someone might know of an already built function I could use rather than me taking the IP and netmask apart, applying those, and reassembling the IPrange.  I suppose I've already wasted more time than I would have saved.  :)

On Thu, Oct 27, 2011 at 10:28 AM, Eric Shubert <ejs@shubes.net> wrote:
On 10/26/2011 09:49 PM, Dazed_75 wrote:
I would like to apply a netmask to an arbitrary IP in a bash/dash script
(e.g. apply 255.255.255.0 to 173.10.3.155 to get 173.10.3.0).  Is there
any easy way to do that without taking the IP apart, doing 4 operations
and reassembling the results?

--
Dazed_75 a.k.a. Larry

The spirit of resistance to government is so valuable on certain
occasions, that I wish it always to be kept alive.
  - Thomas Jefferson


http://tldp.org/LDP/abs/html/ops.html
See "bitwise operators" about half way down the page. I think that's what you're looking for.

--
-Eric 'shubes'


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--
Dazed_75 a.k.a. Larry

The spirit of resistance to government is so valuable on certain occasions, that I wish it always to be kept alive.
  - Thomas Jefferson