#!/usr/bin/env bash
# Bandwidth (Mbit/s)
# v0.0.1
# Kaspars Mickevics
# fxlv
# Displays bandwidth usage for a network interface in Megabits/s
# ifstat
# https://cloud.githubusercontent.com/assets/2462211/12748504/584bbcea-c9b3-11e5-8109-ad8fdcefdc75.png
# string(VAR_NETWORK_INTERFACE="en0"): The interface to track (Usual interface for MacOS wifi is en0)
# based on bandwidth.1s.sh by Ant Cosentino
if [ ! -e /usr/local/bin/ifstat ]; then
echo "Please install ifstat or change the path to it in the script."
exit 1
fi
function kilo_to_mega {
# in networking 1 mbit is 1000 kilobits (not 1024)
printf "%0.3f\n" "$(bc -q <<< scale=3\;"${1}"/1000)"
}
function get_ifstat {
IFSTAT_INTERFACE=$1
# 1 sample for 0.5 second interval
# outputs two values (in/out) in kilobits per second
/usr/local/bin/ifstat -n -w -i "${IFSTAT_INTERFACE}" -b 0.5 1 | tail -n 1
}
function print_ifstat {
kbits_in=$(echo "$1" | awk '{ print $1 }')
kbits_out=$(echo "$1" | awk '{ print $2 }')
mbits_in=$(kilo_to_mega "$kbits_in")
mbits_out=$(kilo_to_mega "$kbits_out")
echo "▼ $mbits_in - $mbits_out ▲"
}
print_ifstat "$(get_ifstat ${VAR_NETWORK_INTERFACE})"
echo "---"