#!/usr/bin/env bash # INTERVAL is equal to 1s because we want to express the bandwidth in sec readonly INTERVAL=1 # UPLOAD and DOWNLOAD index readonly UPLOAD=0 readonly DOWNLOAD=1 # SIZE index are the multiple of the unit byte and value the internationally recommended unit symbol in sec readonly SIZE=( [1]='B/s' [1024]='kB/s' [1048576]='MB/s' [1073741824]='GB/s' ) # interface_get try to automaticaly get the used interface if network_name is empty interface_get() { name="$(tmux show-option -gqv "@dracula-network-bandwidth")" if [[ -z $name ]]; then case "$(uname -s)" in Linux) if type ip >/dev/null; then name="$(ip -o route get 192.168.0.0 | awk '{print $5}')" fi ;; Darwin) if type route >/dev/null; then name="$(route -n get 192.168.0.0 2>/dev/null | awk '/interface: / {print $2}')" fi ;; esac fi echo "$name" } # interface_bytes give an interface name and return both tx/rx Bytes, separated by whitespace (upload first) interface_bytes() { case "$(uname -s)" in Linux) upload=$(cat "/sys/class/net/$1/statistics/tx_bytes") download=$(cat "/sys/class/net/$1/statistics/rx_bytes") echo "$upload $download" ;; Darwin) # column 7 is Ibytes (in bytes, rx, download) and column 10 is Obytes (out bytes, tx, upload) netstat -nbI "$1" | tail -n1 | awk '{print $10 " " $7}' ;; esac } # get_bandwidth return the number of bytes exchanged for tx and rx get_bandwidth() { local upload=0 local download=0 IFS=' ' read -r upload download <<< "$(interface_bytes "$1")" # wait for interval to calculate the difference sleep "$INTERVAL" IFS=' ' read -r new_upload new_download <<< "$(interface_bytes "$1")" upload=$(( $new_upload - $upload )) download=$(( $new_download - $download )) # set to 0 by default echo "${upload:-0} ${download:-0}" } # bandwidth_to_unit convert bytes into its highest unit and add unit symbol in sec bandwidth_to_unit() { local size=1 for i in "${!SIZE[@]}"; do if (($1 < i)); then break fi size="$i" done local result="0.00" if (($1 != 0)); then result="$(awk -v a="$1" -v b="$size" 'BEGIN { printf "%.2f\n", a / b }'