Silly little script to detect when WWAN is being flakey

pling.sh

#!/bin/bash

# WWAN can be flakey. This script pings your ISP's gateway. After 5 missed
# responses, this script produces an audible bell until the host starts
# responding again.

if [[ "$#" -ne '0' ]]; then
    echo "Usage: $0" >&2
    exit 1
fi

threshold=5

# second hop should be ISP gateway assuming a NAT'd host
host=$(traceroute -nm2 8.8.8.8 2>&1 | tail -n 1 | awk '{ print $2 }')

while true; do
    # quiet timeout count packetsize
    status=$(ping -q -t1 -c1 -s0 $host >/dev/null 2>&1; echo $?)

    if [[ "$status" -gt '0' ]]; then
        echo -ne 'x'
        miss=$(($miss+1))
        if [[ "$miss" -gt "$(($threshold - 1))" ]]; then
            echo -ne "\a"
        fi  
    else
         echo -n '.'
         miss=0
    fi  
    sleep 1
done