ipcnt

ipcnt

#!/bin/bash
# The MIT License (MIT)
# 
# Copyright (c) 2015 Phillip Smith
# 
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
# 
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
# 
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.

set -e
set -u

declare ifaces="${1:-}"	# default to blank to avoid unbound var errors
declare iface=

function human_readable() {
  awk '
    function human(x) {
        s="bkMGTEPYZ";
        while (x>=1000 && length(s)>1)
            {x/=1024; s=substr(s,2)}
        return int(x+0.5) substr(s,1,1)
    }
    {gsub(/^[0-9]+/, human($1)); print}'
}

if [ -z "$ifaces" ] ;then
  # get a list of all interfaces on this system
  ifaces=$(ls /sys/class/net)
else
  # make sure the interface supplied exists
  if [ ! -d /sys/class/net/$ifaces ] ; then
    echo "ERROR: interface $ifaces does not exist" >&2
    exit 1
  fi
fi

for iface in $ifaces ; do
  [ "$iface" == 'lo' ] && continue
  [ ! -d "/sys/class/net/${iface}" ] && continue

  declare rx_bytes=$(cat /sys/class/net/${iface}/statistics/rx_bytes | human_readable)
  declare rx_packets=$(cat /sys/class/net/${iface}/statistics/rx_packets)
  declare rx_errors=$(cat /sys/class/net/${iface}/statistics/rx_errors)
  declare tx_bytes=$(cat /sys/class/net/${iface}/statistics/tx_bytes | human_readable)
  declare tx_packets=$(cat /sys/class/net/${iface}/statistics/tx_packets)
  declare tx_errors=$(cat /sys/class/net/${iface}/statistics/tx_errors)
  echo "Statistics for $iface"
  printf "\tRecieved: %-4s (%s)\tErrors: %s\n" $rx_bytes $rx_packets $rx_errors
  printf "\tTransmit: %-4s (%s)\tErrors: %s\n" $tx_bytes $tx_packets $tx_errors
done

exit 0