INTFACE = ARGV

        R1=`cat /sys/class/net/#{INTFACE}/statistics/rx_bytes`
        T1=`cat /sys/class/net/#{INTFACE}/statistics/tx_bytes`
        sleep 1
        R2=`cat /sys/class/net/#{INTFACE}/statistics/rx_bytes`
        T2=`cat /sys/class/net/#{INTFACE}/statistics/tx_bytes`
        TBPS=`expr #{T2} - #{T1}`
        RBPS=`expr #{R2} - #{R1}`

        TKBPS=`expr #{TBPS} / 1024`
        RKBPS=`expr #{RBPS} / 1024`
        print '#{TKBPS}'