netmask in a script

[Dazed_75]

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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