online.rb

#!/usr/bin/env ruby
def online?
	num = 0
	flag_regexp = /R[A-Z]*\n$/m
	IO.popen("ifconfig -s").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
end

Hey buddy, you may want to ensure to close the process that you open. Regards