netmask in a script

[Eric Shubert]

Brian's ipcalc looks like it might simplify things a bit. Nice.

On 10/27/2011 10:57 AM, Dazed_75 wrote:
> 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 at shubes.net
> <mailto:ejs at 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
>     <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
>


-- 
-Eric 'shubes'