# Get custom IN and OUT labels if provided by command line arguments
while [[ $# -gt 1 ]]; do
key="$1"
- case "$key" in
+ case "$key" in
-i|--inlabel)
INLABEL="$2"
shift;;
rx_rate=$(( $rx_diff / $time_diff ))
tx_rate=$(( $tx_diff / $time_diff ))
+round() {
+ echo $(printf %.$2f $(echo "scale=$2;(((10^$2)*$1)+0.5)/(10^$2)" | bc))
+}
+
+format() {
+ if [ $1 == 0 ]; then
+ printf '000K'
+ elif [ $1 -lt 999 ]; then
+ # printf '%sK' "$1";
+ printf %03d%s ${1%.*} K
+ elif [ $1 -lt 10240 ]; then
+ printf '%sM' "`echo "scale=1;$1 / 1024" | bc -l`"
+ elif [ $1 -lt 102400 ]; then
+ printf '0%sM' "$(round `echo "scale=1;$1 / 1024" | bc -l` 0)"
+ elif [ $1 -lt 1024000 ]; then
+ printf '%sM' "$(round `echo "scale=1;$1 / 1024" | bc -l` 0)"
+ else
+ printf '%sG' "$(round `echo "scale=2;$1 / 1048576" | bc -l` 1)"
+ fi
+}
+
# shift by 10 bytes to get KiB/s. If the value is larger than
# 1024^2 = 1048576, then display MiB/s instead
# incoming
echo -n "$INLABEL"
-rx_kib=$(( $rx_rate >> 10 ))
-if hash bc 2>/dev/null && [[ "$rx_rate" -gt 1048576 ]]; then
- printf '%sM' "`echo "scale=1; $rx_kib / 1024" | bc`"
-else
- printf %03d ${rx_kib} # leading zeroes so length is constant
- echo -n "K"
-fi
+format $(( $rx_rate >> 10 ))
echo -n " "
# outgoing
echo -n "$OUTLABEL"
-tx_kib=$(( $tx_rate >> 10 ))
-if hash bc 2>/dev/null && [[ "$tx_rate" -gt 1048576 ]]; then
- printf '%sM' "`echo "scale=1; $tx_kib / 1024" | bc`"
-else
- printf %03d ${tx_kib} # leading zeroes so length is constant
- echo -n "K"
-
-fi
+format $(( $tx_rate >> 10 ))