From: nobu.nokada@...
Date: 2001-11-09T12:15:43+09:00
Subject: [ruby-talk:24732] Re: how to get hostname/MAC address?

Hi,

At Fri, 9 Nov 2001 07:05:43 +0900,
jheard <jheard@acxiom.com> wrote:
> >> irb(main):002:0> system ( 'hostname -i')
> >> 192.168.2.10
> >>
> >> irb(main):001:0> system ( '/sbin/ifconfig | grep HWaddr | cut -c39-')
> >> 00:90:27:2D:5A:C5
> >>
> >> Assuming Unix / Linux & you might consider the hard '39' a bit too kludgy
> >>
> >> -- 
> >> Sincerely etc.,
> >> Christopher Sawtell
> >>
> >>
> > 
> > for Windows,
> > --> IPSocket.getaddress(ENV['MACHINE_NAME'])
> > 
> > should do you.
> > 
> > 
> 
> Sorry, not MACHINE_NAME but HOSTNAME

Without environment variable,

$ ruby -rsocket -e 'puts(IPSocket.getaddress(Socket.gethostname))' 
192.168.2.10


And I recommend regexp rather than magic argument.

$ ruby -e 'puts(($1 if /\bHWaddr\s+([[:xdigit:]:]+)/ =~ `/sbin/ifconfig`))'
00:90:27:2D:5A:C5


Nobu Nakada