Yes Thomas. If you look back a few messages in the thread, you will see
that not only was it suggested, but that is how I solved my need. Thank you
though.
On Fri, Oct 28, 2011 at 1:28 PM,
thomas@redhat.com <
thomas@redhat.com>wrote:
> > Have you looked at ipcalc? It does some really cools stuff and can be
> scripted.
>
> On 10/27/2011 06:19 PM, Brian Cluff wrote:
> > I've never had a need to do any bit twiddling in bash... thanks for this
> > solution, It was very educational.
> >
> > Brian Cluff
> >
> > On 10/27/2011 11:43 AM, Dale Farnsworth wrote:
> >> Larry 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?
> >>
> >> I know you said without disassembly/reassembly, but here are some
> >> bash functions that apply the mask using disassembly/reassembly.
> >>
> >> ===================== begin =======================
> >> to_int()
> >> {
> >> # Convert from dotted-quad to integer
> >> local i=$1
> >> local OIFS="$IFS"
> >> IFS=.
> >> i=($i)
> >> IFS="$OIFS"
> >> echo $(((${i[0]}<< 24) + (${i[1]}<< 16) + (${i[2]}<< 8) +
> >> ${i[3]}))
> >> }
> >>
> >> to_ip()
> >> {
> >> # Covert from integer to dotted-quad
> >> local d=$1
> >> echo $(($d>> 24)).$(($d>> 16& 255)).$(($d>> 8&
> 255)).$(($d&255))
> >> }
> >>
> >> and_ip()
> >> {
> >> # And two ip addresses in dotted-quad format
> >> local ip1=$1
> >> local ip2=$2
> >> echo $(to_ip $(($(to_int $ip1)& $(to_int $ip2))))
> >> }
> >> ===================== end =======================
> >>
> >> Just pass the ip and netmask to and_ip:
> >> Example:
> >>
> >> $ and_ip 11.22.33.44 255.255.255.0
> >> 11.22.33.0
> >>
> >> -Dale
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> >
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>
> - --
> Thomas Cameron, RHCA, RHCSS, RHCDS, RHCVA, RHCX
> Chief Architect, Canada and Central US
> 512-241-0774 office / 512-585-5631 cell
> http://people.redhat.com/tcameron/
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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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