netmask in a script

[Stephen]

There is an android app that does the math. But that's all I got.
On Oct 27, 2011 12:38 AM, "Dazed_75" <lthielster at gmail.com> wrote:

> Thanks Josef, I was hoping there was a way to avoid the manipulation work.
>
> I have never used Python though I have looked at some.  I saw 3 .py files
> and release notes in the download.  I saw no readable description of the
> contents/functionality and more unfamiliar code I didn't want to read.
> probably easier to do the manipulations than to learn Python.
>
> On Thu, Oct 27, 2011 at 12:24 AM, Joseph Sinclair <
> plug-discussion at stcaz.net> wrote:
>
>> well, an IP4 address is just an unsigned int32, and a netmask is just the
>> number of bits to keep...
>> you could turn the dotted notation into an int32, then mask off the proper
>> bits, then translate back to the dotted notation.
>>
>> Or you could use Python for the script and use the ip address library in
>> Python[1] to apply the netmask.
>>
>> [1] http://code.google.com/p/ipaddr-py/
>>
>> 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?
>> >
>> >
>> >
>> >
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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
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