A hideous first-run at some Ruby - using Ohai - to print out IP addresses and MAC addresses for active interfaces.

gistfile1.rb

require 'ohai'
o = Ohai::System.new
o.all_plugins
interfaces = o[:network][:interfaces]
info = Hash.new

interfaces.keys.each do |interface|
  if interfaces[interface][:state] == "up" && interfaces[interface][:encapsulation] == "Ethernet"
    info[interface] = Hash.new
    addresses = interfaces[interface][:addresses]
    addresses.keys.each do |address|
      if addresses[address][:family] == "inet"
        if info[interface][:ipv4].kind_of?(Array) == false
          info[interface][:ipv4] = Array.new
        end
        info[interface][:ipv4].push(address)
      end
      if addresses[address][:family] == "inet6"
        if info[interface][:ipv6].kind_of?(Array) == false
          info[interface][:ipv6] = Array.new
        end
        info[interface][:ipv6].push(address)
      end
      if addresses[address][:family] == "lladdr"
        info[interface][:mac_address] = address
      end
    end
  end
end

info.keys.each do |ifname|
  puts  "[" + ifname + "]"
    puts  "  MAC  --> " + info[ifname][:mac_address]
  if info[ifname].has_key?(:ipv4) == true
    print "  IPv4 --> "
    info[ifname][:ipv4].each do |address|
      print address + " "
    end
  end
  print "\n"
  if info[ifname].has_key?(:ipv6) == true
    print "  IPv6 --> "
    info[ifname][:ipv6].each do |address|
      print address + " "
    end
  end
  print "\n\n"
end