initial

tmux/powerline/segments/ifstat_sys.sh

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+# Show if stats by sampling /sys/.
+# Originally stolen from http://unix.stackexchange.com/questions/41346/upload-download-speed-in-tmux-status-line
+
+run_segment() {
+	sleeptime="0.5"
+	if shell_is_osx; then
+		iface="en0"
+		type="⎆" # "☫" for wlan
+		RXB=$(netstat -i -b | grep -m 1 $iface | awk '{print $7}')
+		TXB=$(netstat -i -b | grep -m 1 $iface | awk '{print $10}')
+		sleep "$sleeptime"
+		RXBN=$(netstat -i -b | grep -m 1 $iface | awk '{print $7}')
+		TXBN=$(netstat -i -b | grep -m 1 $iface | awk '{print $10}')
+	else
+		iface="eth0"
+		type="⎆" # "☫" for wlan
+		RXB=$(</sys/class/net/"$iface"/statistics/rx_bytes)
+		TXB=$(</sys/class/net/"$iface"/statistics/tx_bytes)
+		sleep "$sleeptime"
+		RXBN=$(</sys/class/net/"$iface"/statistics/rx_bytes)
+		TXBN=$(</sys/class/net/"$iface"/statistics/tx_bytes)
+	fi
+	RXDIF=$(echo "$((RXBN - RXB)) / 1024 / ${sleeptime}" | bc )
+	TXDIF=$(echo "$((TXBN - TXB)) / 1024 / ${sleeptime}" | bc )
+
+	if [ $RXDIF -gt 1024 ]; then
+		RXDIF=$(echo "scale=1;${RXDIF} / 1024" | bc)
+		RXDIF_UNIT="M/s"
+	else
+		RXDIF_UNIT="K/s"
+	fi
+	if [ $TXDIF -gt 1024 ]; then
+		TXDIF=$(echo "scale=1;${TXDIF} / 1024" | bc)
+		TXDIF_UNIT="M/s"
+	else
+		TXDIF_UNIT="K/s"
+	fi
+
+	# NOTE: '%5.01' for fixed length always
+	printf "${type} ⇊ %5.01f${RXDIF_UNIT} ⇈ %5.01f${TXDIF_UNIT}"  ${RXDIF} ${TXDIF}
+	return 0
+}