Pull Request

#!/bin/bash

IFNAME=$1
if [ ! -d "/sys/class/net/$IFNAME/statistics" ]; then
	echo "sysfs dir not exists: /sys/class/net/$IFNAME/statistics"
	exit 1
fi

IFSPEED=$2
IFSPEED_PRE=""

if [ -z $IFSPEED ]; then
	IFSPEED="100"
	echo "[INFO] Assuming scale 100 Mbps."
fi

function logline() {
	# 1: CURRENTIN; 2:LASTIN  3: CURRENTOUT 4:LASTOUT
	local BUSY=0

        local IN=$(($1 - $2))
	BUSY=$(($BUSY + $IN))
	local U_IN="KB/s"
	if [ 1024 -lt "$IN" ]; then IN=$(($IN / 1024)); U_IN="MB/s"; fi

	local OUT=$(($3 - $4))
	BUSY=$(($BUSY + $OUT))
	local U_OUT="KB/s"
	if [ 1024 -lt "$OUT" ]; then OUT=$(($OUT / 1024)); U_OUT="MB/s"; fi

	BUSY=$(($BUSY * 8 / 10 / $IFSPEED))
	if [ 100 -lt $BUSY ]; then BUSY=100; fi

	# BUSY_BAR_LEN = $COLUMNS - "IN " + "%4d %4s" + " - OUT " + "%4d %4s " + "- %3d%% "
	BUSY_BAR_LEN=$(($COLUMNS - 3 - 9 - 7 - 10 - 7))
	local BUSY_BAR
	local counter=$(($BUSY * $BUSY_BAR_LEN / 100))
	while [ $counter -gt 0 ]; do BUSY_BAR="${BUSY_BAR}|"; counter=$(($counter - 1)); done
	if [ -z "$BUSY_BAR" ]; then BUSY_BAR="|"; fi

	if [[ "$NOHISTORY" != y* ]]; then
		logline_with_history \
			"$(printf "\rIN %4d %s | OUT %4d %s | %3d%% %s" $IN "$U_IN" $OUT "$U_OUT" $BUSY "$BUSY_BAR")" \
			"$(printf "\nIN %4d %s | OUT %4d %s | Interface: $IFNAME" $IN "$U_IN" $OUT "$U_OUT")"
	else
		logline_without_history \
			"$(printf "\rIN %4d %s | OUT %4d %s | Interface: $IFNAME" $IN "$U_IN" $OUT "$U_OUT")"
	fi
}

function logline_with_history() {
	local HISTORY=$1
	local STRING=$2
	printf "%-${COLUMNS}s" "$HISTORY"
	printf "%-${COLUMNS}s" "$STRING"
}
function logline_without_history() {
	local STRING=$1
	printf "%-${COLUMNS}s" "$STRING"
}

function getbytesin() {
	# 1: ifname
	cat /sys/class/net/$IFNAME/statistics/rx_bytes
}

function getbytesout() {
	#1: ifname
	cat /sys/class/net/$IFNAME/statistics/tx_bytes
}

STARTBIN=$(getbytesin)
STARTBOUT=$(getbytesout)

while(true); do
	LASTIN=$(($(getbytesin) / 1024))
	LASTOUT=$(($(getbytesout) / 1024))
	sleep 1
	CURRENTIN=$(($(getbytesin) / 1024))
	CURRENTOUT=$(($(getbytesout) / 1024))
	logline $CURRENTIN $LASTIN $CURRENTOUT $LASTOUT
done

# Pull Request br: neruthes/refactor ``` #!/bin/bash IFNAME=$1 if [ ! -d "/sys/class/net/$IFNAME/statistics" ]; then echo "sysfs dir not exists: /sys/class/net/$IFNAME/statistics" exit 1 fi IFSPEED=$2 IFSPEED_PRE="" if [ -z $IFSPEED ]; then IFSPEED="100" echo "[INFO] Assuming scale 100 Mbps." fi function logline() { # 1: CURRENTIN; 2:LASTIN 3: CURRENTOUT 4:LASTOUT local BUSY=0 local IN=$(($1 - $2)) BUSY=$(($BUSY + $IN)) local U_IN="KB/s" if [ 1024 -lt "$IN" ]; then IN=$(($IN / 1024)); U_IN="MB/s"; fi local OUT=$(($3 - $4)) BUSY=$(($BUSY + $OUT)) local U_OUT="KB/s" if [ 1024 -lt "$OUT" ]; then OUT=$(($OUT / 1024)); U_OUT="MB/s"; fi BUSY=$(($BUSY * 8 / 10 / $IFSPEED)) if [ 100 -lt $BUSY ]; then BUSY=100; fi # BUSY_BAR_LEN = $COLUMNS - "IN " + "%4d %4s" + " - OUT " + "%4d %4s " + "- %3d%% " BUSY_BAR_LEN=$(($COLUMNS - 3 - 9 - 7 - 10 - 7)) local BUSY_BAR local counter=$(($BUSY * $BUSY_BAR_LEN / 100)) while [ $counter -gt 0 ]; do BUSY_BAR="${BUSY_BAR}|"; counter=$(($counter - 1)); done if [ -z "$BUSY_BAR" ]; then BUSY_BAR="|"; fi if [[ "$NOHISTORY" != y* ]]; then logline_with_history \ "$(printf "\rIN %4d %s | OUT %4d %s | %3d%% %s" $IN "$U_IN" $OUT "$U_OUT" $BUSY "$BUSY_BAR")" \ "$(printf "\nIN %4d %s | OUT %4d %s | Interface: $IFNAME" $IN "$U_IN" $OUT "$U_OUT")" else logline_without_history \ "$(printf "\rIN %4d %s | OUT %4d %s | Interface: $IFNAME" $IN "$U_IN" $OUT "$U_OUT")" fi } function logline_with_history() { local HISTORY=$1 local STRING=$2 printf "%-${COLUMNS}s" "$HISTORY" printf "%-${COLUMNS}s" "$STRING" } function logline_without_history() { local STRING=$1 printf "%-${COLUMNS}s" "$STRING" } function getbytesin() { # 1: ifname cat /sys/class/net/$IFNAME/statistics/rx_bytes } function getbytesout() { #1: ifname cat /sys/class/net/$IFNAME/statistics/tx_bytes } STARTBIN=$(getbytesin) STARTBOUT=$(getbytesout) while(true); do LASTIN=$(($(getbytesin) / 1024)) LASTOUT=$(($(getbytesout) / 1024)) sleep 1 CURRENTIN=$(($(getbytesin) / 1024)) CURRENTOUT=$(($(getbytesout) / 1024)) logline $CURRENTIN $LASTIN $CURRENTOUT $LASTOUT done ```