Updated so it doesn't leave defunct ifconfig processes

online.rb

#!/usr/bin/env ruby
def online?
  num = 0
  flag_regexp = /R[A-Z]*\n$/m
  process = IO.popen("ifconfig -s")
  process.each do |line|
    num = num + 1
    # ignore first line
    next if num == 1
    # ignore lo
    next if line[0,2] == 'lo'
    # test if this interface has the 'R' flag
    return true if flag_regexp =~ line
  end
  return false
ensure
  process.close
end