Show bandwidth usage in GNU Screen status line

Написал простой скрипт для показа скорости загрузки/отдачи в статусной строке GNU Screen. Данный скрипт основан на скрипте для tmux, однако я его основательно переписал, убрав вызов sleep, из-за которого Screen блокировался при обновлении статусной строки.

	backtick 1 1 1 /home/$USER/bin/bwstat.sh eth0
	hardstatus alwayslastline '%{= G}[%= %{= w}%?%-Lw%?%{= R}%n*%f %t%?%{= R}(%u)%?%{= w}%+Lw%?%= %{= g}][ %{y}%1`%{g} ][ %{y}L: %l %{g}]'

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	#!/bin/bash
	# bwstat.sh -- Calculate bandwidth usage for a given interface.
	#
	# Copyright (C) 2013 Artyom V. Poptsov <poptsov.artyom@gmail.com>
	#
	# Copying and distribution of this file, with or without modification,
	# are permitted in any medium without royalty provided the copyright
	# notice and this notice are preserved. This file is offered as-is,
	# without any warranty.
	BWSTAT_FILE=/tmp/bwstat
	IFACE=$1
	RES=""
	if [ -s $BWSTAT_FILE ]; then
	TIME_OLD=$(cat $BWSTAT_FILE | cut -d ' ' -f 1)
	RXB_OLD=$(cat $BWSTAT_FILE | cut -d ' ' -f 2)
	TXB_OLD=$(cat $BWSTAT_FILE | cut -d ' ' -f 3)
	RXB_NEW=$(</sys/class/net/"$IFACE"/statistics/rx_bytes)
	TXB_NEW=$(</sys/class/net/"$IFACE"/statistics/tx_bytes)
	TIME_NEW=`date +%s`
	PERIOD=$((TIME_NEW - TIME_OLD))
	RXDIF=$(echo $((RXB_NEW - RXB_OLD)))
	TXDIF=$(echo $((TXB_NEW - TXB_OLD)))
	RES="U$((TXDIF / 1024 / PERIOD)) D$((RXDIF / 1024 / PERIOD))"
	echo "$TIME_NEW $RXB_NEW $TXB_NEW" > $BWSTAT_FILE
	else
	RXB=$(</sys/class/net/"$iface"/statistics/rx_bytes)
	TXB=$(</sys/class/net/"$iface"/statistics/tx_bytes)
	echo "$(date +%s) $RXB $TXB" > $BWSTAT_FILE
	chmod 600 $BWSTAT_FILE
	RES="U0 D0"
	fi
	echo -e "$RES"

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- Артём